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**The Praxis Mathematics Tests**

Workshop PPT #2 Slide show created by Jolene M. Morris

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ETS Praxis Website Official website where you can find more information about the Praxis tests

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NCTM Website The National Council of Teachers of Mathematics (NCTM) is the national organization that sets the standards for what mathematics concepts should be taught and at what grade levels.

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Jolene’s Website Jolene’s website where you can find Praxis resources such as Jolene’s 400 Praxis flashcards in a format to import into an app such as Flashcards To Go or Anki or Quizlet

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**Agenda (Slide 5) Number Theory (hunter green) Fractions (black)**

Decimals (light blue) Ratios, Proportions, & Percentages (dk blue) Integers (red) Geometry & Measurement (burgundy) Data, Statistics, & Probability (pink) Algebraic Reasoning (green)

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Number Theory

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Our Number System

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Place Value

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**Ordering Large Numbers**

Write them above one another with the place values lined up. Starting from the left, look for the largest value. For example, if you are asked to order: 5, , , ,922

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Rounding Numbers Rounding a number requires that you understand place value. Look at the digit to the right of the place being rounded. If that digit on the right is 5 or higher, add 1 to the place being rounded; otherwise, leave the place being rounded as is. Change all places to the right of the place being rounded to zeroes.

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Comparison Symbols < less than > greater than ≤ less than or equal to ≥ greater than or equal to = equal to Each of these symbols can also be negated by putting a slash mark through them, such as not equal to: ≠

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Estimation

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**Squared & Cubed Numbers**

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Divisibility Rules 2 = Even numbers (ending in 0, 2, 4, 6, and 8) 3 = If repeated sums of the digits result in 3, 6, or 9 4 = If the last two digits are divisible by 4 5 = If the last digit is 0 or 5 6 = If the number is divisible by both 2 and 3 8 = If the last three digits are divisible by 8 9 = If repeated sums of the digits result in 9 10 = If the last digit is 0

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Prime Numbers Prime Numbers = Integers greater than 1 with exactly 2 factors or divisors; numbers that are evenly divisible by only 1 and themselves. The number 2 is the first prime and it is the only even number that is prime. The number 1 is neither prime nor composite. Memorize the prime numbers 1-100: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97

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**Other Number Classifications**

Prime vs. Composite Odd vs. Even Denominate numbers Consecutive integers Cardinal numbers Ordinal numbers

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Number Line A number line is a straight line where each point of that line corresponds to a real number. A line is made up of an infinite number of points and there are an infinite amount of real numbers. Usually the line is marked off to show the integers, including zero. A number line is generally written as a horizontal line.

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Expanded Notation

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**Interpreting Remainders**

Do you round up? Do you round down? Do you use the remainder as part of the answer (or as the entire answer)? How many boxes can be filled? (use only the quotient; ignore the remainder) How many cans are needed to paint the wall? (round the quotient to the next greater whole #) How many in the last box that isn’t completely full? (use only the remainder)

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Prime Factorization Thus, the prime factorization of 120 = 2 x 2 x 2 x 3 x 5

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GCF 12 = 2 × 2 × 3 18 = × 3 × 3 30 = × × 5 GCF = × 3 The factors common to all three numbers above are 2 and 3. 2 x 3 = 6 so 6 is the GCF of 12, 18, and 30.

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LCM

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**Multiplying by Powers of 10**

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Dividing by Powers of 10

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**4 Ways to Indicate Multiplication**

Using a small “×”, such as 3 × 5. Note that the “×” is not used for multiplication in algebra because it might be confused with the variable “×”. Using a small, raised dot, such as 3 • 5 Using parenthesis, such as (3)(5) or 3(5) or (3)5 Using no symbol, such as 3y meaning 3 times y

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**Properties of Operations**

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**PEMDAS Please Excuse My Dear Aunt Sally**

Order of Operations Simplify inside parentheses or grouping symbols Simplify any expressions with exponents Perform multiplication & division from left to right Perform addition & subtraction from left to right PEMDAS Please Excuse My Dear Aunt Sally

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**Properties of Zero Division by zero is undefined**

Zero is neither positive nor negative Zero is the additive identity Any number multiplied by zero equals zero Zero is used as the universal place holder Zero is neither prime nor composite Zero has no multiplicative inverse A number with an exponent of zero equals 1 Zero factorial equals 1

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**Properties of One One is the multiplicative identity**

Any number multiplied by one equals the number One is neither prime nor composite A number with exponent of 1 equals the number The number one raised to any power equals one Any nonzero number divided by itself equals one

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Identity Property

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Number Theory ANY QUESTIONS?

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Fractions

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What is a Fraction? A fraction represents equal-sized parts of a whole. The top number is called the numerator The bottom number , the denominator, is a denominate number (measurement of size) The line between numerator & denominator indicates division and is called a vinculum.

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**Proper & Improper Fractions**

A proper fraction has a numerator smaller than the denominator and indicates a fraction less than one whole: 3/8 1/4 14/15 4/5 An improper fraction has a numerator larger than (or equal to) the denominator and indicates a fraction that is equal to one or more than one whole: 3/2 7/4 16/ / /5 An improper fraction can be changed into a whole number or a mixed number by dividing the denominator into the numerator.

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Common Fraction

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Mixed Number A mixed number is a whole number and a proper fraction combined. Mixed numbers may also be called mixed fractions. This graphic shows two whole pizzas and a fraction of 3 pieces out of 4 2 3/4

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**Greatest Common Factor**

The GCF is the largest number that is a factor of all the numbers. One way to find the GCF is to write the prime factorization of each of the numbers above each other. Then “bring down” those factors that are in common and multiply them: Find the GCF of 12, 18, 30: 12 = 2 × 2 × 3 18 = × 3 × 3 30 = × × 5 GCF = × = 6

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LCD The Lowest Common Denominator is the smallest number that is a multiple of all the denominators. One way to find the LCD is to count by each of the denominators and find the first number that is a multiple of all. Another way to find the LCD is to write a prime factorization of each denominator, and then “bring down” one of each factor and multiply.

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Equivalent Fractions Fractions that simplify to the same simple fraction. When two fractions are equivalent, their cross products are equal : 3 x 6 = 18 2 x 9 = 18

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Simplify Fractions

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Mixed Number A mixed number indicates the whole amounts and the parts (a fraction). To convert a mixed number to an improper fraction, multiply the whole number by how many parts are in a whole, and then add the remaining parts. For example, 6 2/3 means there are 6 whole amounts of 3/3 (6 x 3 = 18) so there are 18/3. Adding the remaining 2/3 results in a total of 20/3 in 6 2/3.

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Improper Fractions An improper fraction shows a total number of parts, but in those parts is at least one whole. To convert an improper fraction to a mixed number, divide the numerator by how many parts are in a whole. The quotient becomes the whole number and the remainder becomes the numerator of the fraction part of the mixed number. For example, 23/3 equals 23 divided by 3, which is 7 r 2 or 7 2/3

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**Why Find Common Denominators?**

footers footers footers

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**Why Change to Common Denominators?**

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**Why Change to Common Denominators?**

3 apples oranges 7 ??????

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**Add Fractions & Mixed Numbers**

Write the two fractions/mixed numbers vertically above each other (lining up place value) Change the fractions to a common denominator. Add the numerators only. Put that sum over the common denominator. Simplify the answer.

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**Subtract Fractions & Mixed Numbers**

Write the two fractions/mixed numbers vertically above each other (lining up place value) Change the fractions to a common denominator. Subtract the numerators only (careful to regroup one whole (2/2, 3/3, 4/4, etc.) if you need to borrow). Put that difference over the common denominator. Simplify the answer.

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**Multiply Fractions& Mixed Numbers**

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Reciprocal A reciprocal is a fraction where the numerator and denominator have been switched. Multiplying any fraction by its reciprocal results in an answer of 1. As such, a reciprocal is called a multiplicative inverse. NOTE: Since there is no rule on how to divide fractions, but because multiplication is the inverse of division and a reciprocal is the inverse of a fraction, you can divide fractions by multiplying by the reciprocal of the divisor. Hence, the inverse of an inverse results in the same answer as if you had divided.

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**Divide Fractions& Mixed Numbers**

Change any mixed numbers and any whole numbers to improper fractions with a “1” on the denominator. Write the two fractions horizontally beside each other. Write the reciprocal of the divisor (flip the second fraction upside down) and change the operation to multiplication. Expand each numerator and each denominator into a prime factorization. “Cancel” any ones such as 3/3 or 5/5. Multiply what is left straight across.

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**Change Fractions to Decimals & Percentages**

Change a fraction to a decimal by dividing the denominator into the numerator. Keep dividing until the decimal number repeats or terminates. Draw a line (vinculum) above the repeating portion. Change a fraction to a percent by first changing it to a decimal as explained above, and then moving the decimal point two places to the right. Remember to append the percent symbol.

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**Comparing & Ordering Fractions**

Cross Multiply (Means extremes property) More than two fractions: change them to common denominators (or use reasoning, such as: are they more than half)

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Fractions ANY QUESTIONS?

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Decimals

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Decimal Point A decimal point is a period that indicates the location of the one’s place – the decimal point always comes to the right of the one’s place. If there are no fractional decimal numbers to the right of the decimal point, the decimal point doesn’t have to be written. It is understood.

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**Comparing Decimal Numbers**

Line up the decimal numbers according to place value (as though you were going to add them). Starting at the left-most place value, compare the numbers in each place value to find the largest, next largest, etc.

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Addition Decimal numbers are added exactly the same as whole numbers: line up the numbers by place value and add each place value from the right to the left. When the decimal numbers are lined up by place value properly, the decimal points in each number are also lined up. Any number without a decimal point is lined up so the ones place is right before the decimal point (there is an understood decimal point after the one’s place). It may help to write zeros in empty places to facilitate addition.

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Subtraction Decimal numbers are subtracted exactly the same as whole numbers: line up the numbers by place value and subtract each place value from the right to the left. When the decimal numbers are lined up by place value properly, the decimal points in each number are also lined up. Any number without a decimal point is lined up so the ones place is right before the decimal point (there is an understood decimal point after the ones place). It may help to write zeros in empty places to facilitate subtraction.

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Multiplication Decimal numbers are multiplied by temporarily ignoring the decimal point. Multiply the two numbers as though they were whole numbers. In the final product, place the decimal point to signify the number of decimal places in both numbers of the original problem. For example: 2.3 (one decimal place) x (three decimal places) is the same as 23 x 1456 with the answer having four decimal places (1 + 3 from the original problem)

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Division Division is not defined for decimal numbers. In order to divide by a decimal number, we change that divisor into a whole number: First multiply each number by powers of 10 – multiply by whatever is necessary to make the divisor a whole number. Then divide as you would with whole numbers. Wherever the decimal point is in the dividend, it floats directly up to that position in the quotient (answer).

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**Multiplying by Powers of 10**

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Dividing by Powers of 10

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**Scientific Notation 1234.5 1.2345 × 103**

Scientific Notation is a way to write very large or very small numbers using powers of 10. To convert a number into scientific notation, move the decimal point so the resulting number is between 1 and 10. Then state the power of 10. Because we use a Base 10 number system, an easy way to know what power of 10 is needed, the exponent indicates the number of decimal places the decimal point was moved. The exponent is negative if the decimal point was moved to the right; the exponent is positive if the decimal point was moved to the left. × 103

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Decimals ANY QUESTIONS?

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**Ratios, Proportions, & Percentages**

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What is a Ratio? A ratio is a comparison of two numbers using division. Write a ratio using a fraction bar, a colon, or the word “to” 3:2 3/2 3 to 2

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**Fractions & Ratios A fraction compares PART to WHOLE**

A ratio compares any two numbers Convert a fraction into a ratio by changing denominator to the difference (D – N) Example: 2/3 becomes 2:1

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What is a Proportion?

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**How to Solve Proportions**

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**(per = divided by; cent = 100)**

What is a Percentage? A percentage (or a percent) is a way of expressing a number, especially a ratio, as a fraction of 100. (per = divided by; cent = 100) The percent key on a calculator merely divides by 100. If your calculator doesn’t have a percent key, hit the divide key and then 100.

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**3 Types of % Problems What number is 15% of 45? x = (0.15) ∙ (45)**

What percent of 45 is 15? 45 ∙ x = 15 or 45x = 15 15% of what number is 45? (0.15) ∙ x = 45 or 0.15x=45

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**Convert % to Decimals & Fractions**

Change a percent to a decimal by moving the decimal point two places to the left and removing the percent sign: 14% = 0.14 Change a percent to a fraction by writing the percent as a fraction over 100 and simplifying: 14% = 14/100, which simplifies to 7/50 Remember: per = divided by; cent = 100

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**Convert Decimals to % 0.14 = 14%**

Change a decimal to a percentage by moving the decimal point two places to the right and appending the percent sign: 0.14 = 14%

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**Solve % Using Proportions**

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**what number variable (x) is = of multiply**

Solve % Using Algebra To solve percentages using algebra, write the problem as an algebraic statement where what number variable (x) is = of multiply What number is 15% of 45? x = (0.15) ∙ (45) What percent of 45 is 15? 45 ∙ x = 15 or 45x = 15 15% of what number is 45? (0.15) ∙ x = 45 or 0.15x=45

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**Unit Analysis Video: JoleneMorris.com, Math 115, Wk 2**

Unit Analysis is the process of multiplying by successive conversion units (written in fraction form). Unit Analysis Video: JoleneMorris.com, Math 115, Wk 2 Video explaining unit analysis for English units (JoleneMorris.com, Math 115, Wk6) Video explaining unit analysis for Metric units (JoleneMorris.com, Math 115, Wk6)

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Denominate Number Specifies a quantity in terms of a number and a unit of measurement. For example, 7 feet and 16 acres are denominate numbers.

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Rate & Unit Rate A rate is a ratio between two measurements with different units. In addition to the three ways to write a ratio, rates may also use the word “per”. Rates are usually simplified to a one in the denominator (unit rate). 13 miles per gallon $4.59 per pound 12 inches per foot

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Interest

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Sales Tax Sales Tax is written in percentages (which are converted to decimal to computer sales tax). FP = MP + (ST × MP) If you know two of those three amounts, you can use basic algebra to find the missing number. Remember to state the sales tax as a percentage in application problems.

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**Discounts Usually written as percentages.**

Amount by which the purchase price is reduced. Discount amount is the original sales price multiplied by the percentage of discount. Discounted price is the difference of the original price and the discount amount. OP – (OP * D) = DP where OP is the original price, D is the discount percentage written as a decimal number, and DP is the discounted price.

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Percent of Change The percent of change is also known as the percent of increase or the percent of decrease. To calculate the percent of change, Find the difference between the new amount and the original amount Divide that difference by the original amount Multiply by 100

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Sales Commission C = ar, where C = commission earned, a = amount of sale, and r = commission rate. Example: Juana sells cars on a 3% commission rate. She just sold a car for $23,500. What was her commission? C = ar C = 23500(.03) C = $705

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**Ratios, Proportions, & Percentages**

ANY QUESTIONS?

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Integers

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What are Integers? The counting numbers, their negatives, and zero (…, -3, -2, -1, 0, 1, 2, 3 …) The symbol used for the set of integers is ℤ.

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Number Line A number line is a straight line where each point of that line corresponds to a real number. A line is made up of an infinite number of points and there are an infinite amount of real numbers. Usually the line is marked off to show the integers, including zero. A number line is generally written as a horizontal line.

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**Absolute Value The value portion of a number without a sign.**

Also described as the distance on a number line from 0. Zero is the only number that is its own absolute value (because zero is neither positive nor negative).

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**Properties of Absolute Value**

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**Ordering & Comparing Integers**

Remember that negative numbers are always smaller than positive numbers. It helps to place the numbers on a number line to compare them. The larger the value of a positive number, the larger the number is. The larger the absolute value of a negative number, the smaller the number.

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Classroom Activity

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Adding Integers If the signs are the same, add the absolute values of the numbers and give the result their same sign. If the signs are different, subtract the absolute values of the numbers and give them the same sign as the number with the larger absolute value.

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Subtracting Integers Because a negative number is the inverse of a positive number, and because subtraction is the inverse operation of addition, the RULE for subtracting integers is: Change the sign of the second number to its opposite and change the operation to addition. Then, follow the rules for adding integers.

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Multiplying Integers If the signs are the same, multiply the absolute values of the numbers and give the result a positive sign. If the signs are different, multiply the absolute values of the numbers and give the result a negative sign.

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Dividing Integers If the signs are the same, divide the absolute values of the numbers and give the result a positive sign. If the signs are different, divide the absolute values of the numbers and give the result a negative sign.

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**Review Properties in Number Theory Packet**

Zero One Identity (additive & multiplicative) Inverse (additive & multiplicative)

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Integers ANY QUESTIONS?

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**Geometry & Measurement**

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Geometry Symbols

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**Definitions Point Line Plane Line Segment Ray Angle Parallel**

Perpendicular Vertex Arc Coplanar Collinear Bisector Chord Diameter Radius Circumference Symmetry Surface Area Perimeter Area Volume Transversal Polygon Similar Congruent Protractor Compass Density Unit Analysis Golden Ratio

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**Angles An acute angle measures less than 90°**

A straight angle measures 180° A right angle measures 90° An obtuse angle measures between 90°-180° A reflex angle is measured in a clockwise direction as opposed to the normal counter-clockwise direction.

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More About Angles When two lines intersect, they form four angles. The two angles opposite each other are called vertical angles. Complementary angles are two angles whose measure adds to 90°. Supplementary angles are two angles whose measure adds to 180°. Two angles are adjacent angles if they share a common vertex, they share a common side, AND they do not share any interior points. An exterior angle is an angle on the outside of a polygon that is formed by extending the side of the polygon When a transversal line crosses two other lines, it forms eight angles -- Corresponding angles are angles that are in the same position on each of the lines.

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**Triangles Classify triangles by their legs**

Scalene triangle - all legs are of different length. Equilateral triangle - all three legs (sides) are of equal measure. Isosceles triangle - two of the three legs are of equal measure Classify triangles by their angles Right triangle - one angle is a right angle. Acute triangle - all three angles are less than 90° Obtuse triangle - one of the angles is obtuse.

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Pythagorean Theorem

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**3-Dimensional Solids Sphere Rectangular Solid (Cuboid) Cube Cylinder**

Cone Prism Pyramid Polyhedron Euler’s Polyhedron Formula is V – E + F = 2

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**Measurement English System or Common System Metric System**

Length = inch, foot, yard, rod, mile, etc. Weight = ounce, pound, Ton, etc. Volume = liquid ounces, cup, pint, quart, gallon, etc. Metric System Meter Gram Liter

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Temperature

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**Converting Units of Measurement**

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Tessellations A tessellation is a two-dimensional plane created by one or more polygon shapes fitted into each other so no “open space” remains. Equilateral triangles, squares, and hexagons are the only regular polygons that tessellate. Check out the tessellations of M. C. Escher:

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Transformations A transformation in geometry changes the position of a shape on the coordinate plane. There are four forms of transformation: translation (slide) rotation (turn) dilation (scale) reflection (flip)

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Net (or network) A net is a two-dimensional representation of a three-dimensional object. If a net is cut out, it can be put together to form the three-dimensional object it represents.

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**Geometry & Measurement**

ANY QUESTIONS?

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**Data, Statistics, & Probability**

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**Measures of Central Tendency**

Data has a tendency to cluster or center on certain values. The term “average” is also used to indicate measures of central tendency. Mean (evenly distributed / “average”) Mode (bimodal distribution / most popular) Median (outliers) Range

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Quartiles Quartiles are three points that divide a set of ordered data into four equal groups. The first quartile, also called the lower quartile, splits off the lower 25% of the data. It is denoted by Q1 The second quartile, also called the median, splits the data in half. It is denoted by Q2 The third quartile, also called the upper quartile, splits off the higher 25% of the data. It is denoted by Q3

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Trends A trend is the general direction data tends to move. From a line graph, a trend can be obvious when the line is going in an up or down pattern. Example: In the stock market, when stocks are trending down, it is called a bear market. When stocks are trending up, it is called a bull market. (A mnemonic to remember which is which: A bear has claws that curve downward and a bull has horns which curve upward.)

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Algorithm An algorithm is a step-by-step process for solving a problem. An example of an addition algorithm is: Line up the numbers Add each column starting on the right Carry any tens-place digits to the next column Place commas between periods in the answer An algorithm is often written as a flowchart showing steps, branches, and decisions.

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Probability Ratio of how likely a specific event is to happen when compared to all possibilities of events that might happen. Most often written as a fraction, but it may also be written as a decimal or a percentage. Odds and probability are related concepts. With odds, you compare the number of favorable outcomes to the number of remaining (unfavorable) outcomes.

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**Probability of Multiple Events**

Independent (OR) , mutually exclusive add Independent, non-exclusive add then subtract the events in common Dependent (AND) multiply (Fundamental Counting Principle) If dependent, be sure to use the conditional second probability

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**Odds Related to probability**

Probability favorable outcomes / possible outcomes Odds favorable outcomes / unfavorable outcomes EXAMPLE: If you have a box with 2 red balls and 3 blue balls, the probability of randomly picking a red ball is 2 out of 5 or 2/5. The odds of randomly picking a red ball are 2 for and 3 against, or 2:3

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5 Rules of Probability

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Tree Diagram A tree diagram is a graphic organizer that lists all possibilities of a sequence of events in a systematic way.

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Factorial

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**Sequences Series Arithmetic – a common number added**

Geometric – a common number multiplied Fibonacci – each term comprised of the sum of previous two terms Series Harmonic – sum of progressive unit fractions

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**Charts & Graphs (see study packet)**

Bar (broken scale) Histogram Line Circle or Pie Pictograph Table Scatterplot Venn Diagram Stem & Leaf Plot Box & Whiskers Plot Logic Diagram Flow Chart

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Deductive & Inductive Deductive reasoning is a form of logic starting with statements of fact and drawing logical conclusions. If the laws of logic are followed from the statements of fact, the conclusions are true. It often helps to draw logic circles when working with deductive reasoning. Inductive reasoning is making sufficient observations that conclusions can be formed.

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**Data, Statistics, & Probability**

ANY QUESTIONS?

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Algebraic Reasoning

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**Algebra & Algebraic Thinking**

Algebra is the study of numbers, number patterns, and relationships among numbers. Algebraic thinking is the study of our number system, patterns, representations, and mathematical reasoning. A variable is used in algebra to represent a value that changes within the parameters of the problem. Lowercase letters of the alphabet are generally used to denote a variable. The opposite of a variable is a constant. The number multiplied to the variable is a coefficient. -2x3

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Real Number System

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**Properties of Operations**

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**PEMDAS Please Excuse My Dear Aunt Sally**

Order of Operations Simplify inside parentheses or grouping symbols Simplify any expressions with exponents Perform multiplication & division from left to right Perform addition & subtraction from left to right PEMDAS Please Excuse My Dear Aunt Sally

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**Expressions & Equations**

An expression is a collection of terms that have been added or subtracted. An equation is a statement where an algebraic expression is equal to another algebraic expression or constant. A literal equation is an equation made up of only known, measurable quantities. A literal equation is the same as a formula. An inequality is similar to an equation, but the two sides are NOT equal.

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Words that Signal + - × ÷ Addition: add, sum, increase, total, rise, plus, grow, added to, more than, increased by, gain… Subtraction: subtract, subtracted from, minus, difference, take away less than, decreased by… Multiplication: multiply, multiplied by, product, times, of, twice… Division: divide, divided by, quotient, per, ratio, half, …

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**Function Relationship is simply a set of ordered pairs.**

Function is where each input is related to exactly one output. One-to-one Correspondence is a function where each output has exactly one input. Domain (x) Range (y)

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Absolute Value Absolute value is the value portion of a number without a sign. Absolute values are also described as the distance on a number line from 0. Zero is the only number that is its own absolute value (because zero is neither positive nor negative). | |

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**Properties of Absolute Value**

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Literal Equation A literal equation is an equation made up of only known, measurable quantities. A literal equation is the same as a formula. With a literal equation, you are not solving for an unknown quantity that varies. Instead, you are manipulating the letters/variables in the equation to a different form to substitute values in it.

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**Solving Algebraic Word Problems (see the study packet)**

Consecutive numbers Rectangular area & perimeter Triangles Unit conversion Mixtures Investments with interest Discounts & Commissions Distance-Speed-Time & Uniform motion

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**Simultaneous Equations**

Simultaneous Equations are two or more equations with multiple variables. These are often called systems of equations. There are many ways to solve a system of equations. Three ways discussed in beginning algebra are: Elimination (sometimes called adding) Substitution Graphing

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Polynomials A polynomial is an algebraic expression with one or more terms. A polynomial cannot have a variable in the denominator (which is a negative exponent). A polynomial with one term is called a monomial; two terms, a binomial; and three terms, a trinomial. The term with the highest exponent (sum) determines the degree of the polynomial. degree type of polynomial 1 linear 2 quadratic 3 cubic

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**Classifying Polynomials**

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**Factoring Polynomials**

Factor out any common factors in all terms. If the polynomial has four terms, factor it by grouping. If it is a binomial, look for a difference of squares, a sum of cubes, or a difference of cubes. (Note that a sum of squares cannot be factored.) If it is a trinomial and the coefficient of the x2 term = 1, un-FOIL to factor. If it is a trinomial and the coefficient of the x2 term ≠ 1, use the AC method to factor.

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Quadratic Equation A quadratic equation is a second-degree polynomial equation (the exponent on the leading term is a 2). There are many ways to solve a quadratic equation, but the five most common ways are: Factor and set each factor equal to 0 If there is no x-term, solve for x2 and apply the square root method. Graph the equation (as a parabola) and determine the solutions where the parabola crosses the x-axis Complete the square Use the quadratic formula

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Distance Formula The distance formula is used to find the distance between two points. The distance formula can be obtained by creating a triangle and using the Pythagorean Theorem to find the length of the hypotenuse. The hypotenuse of the triangle will be the distance between the two points.

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Coordinate Grid A coordinate plane is a two-dimensional grid for locating points. There is an x-axis and a y-axis at 90-degree angles, which divide the grid into four quadrants that are numbered counter-clockwise using Roman numerals. The origin is where the two axes cross (0, 0). A coordinate pair is a pair of numbers indicating the location of a point (x, y). Sometimes called a Cartesian grid after the mathematician René Descartes ( )

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Slope of a Line The slope of a line is an algebraic concept used to graph linear equations. In the equation y = mx + b, the variable m represents the slope of the line. Slope is calculated by dividing the change in the y-coordinate (the rise) by the change in the x-coordinate (the run). Parallel lines have equivalent slopes. Perpendicular lines have slopes that are negative and reciprocal of each other. To graph a line when the slope and the y-intercept are known, plot the y-intercept and then use the slope to count UP and OVER to find another point on the line.

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**Graphing a Quadratic Equation**

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Rules for Exponents

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Rules for Square Roots

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**Simplifying Square Roots**

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**Approximating Square Roots**

Approximating square roots means to find the approximate value of a number’s square root. We find approximate square roots by comparing the number to perfect square numbers where the square roots are known. For example, to find the approximate square root of 51, use the fact that 7 x 7 = 49 and 8 x 8 = 64. Since 51 is between the perfect squares of 49 and 64 (but closer to 49 than 64), the approximate square root of 51 is between 7 and 8 (but closer to 7 than 8). The approximate square root of 51 is 7.1 or 7.2

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Algebraic Reasoning ANY QUESTIONS?

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Praxis Workshop PPT #2 ANY QUESTIONS?

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