Download presentation

Presentation is loading. Please wait.

Published byGavin Verne Modified over 3 years ago

1
**COMPREHENSIVE REVIEW FOR MIDDLE SCHOOL MATHEMATICS**

2013

2
**COMPREHENSIVE REVIEW FOR MIDDLE SCHOOL MATHEMATICS**

Purpose: Mathematics Review for 7th Grade (Can be used as enrichment or remediation for most middle school levels) Contents: Concept explanations & practice problems. Sources: PA Standards-PDE website. Additional Reinforcement: (links provided throughout) (links provided throughout) and PSSA Coach workbook Created by: Jessie Minor

3
**EXPERIMENTAL PROBABILITY!**

IN ORDER TO CALCULATE EXPERIMENTAL PROBABILITY OF AN EVENT USE THE FOLLOWING DEFINITION: P(Event)= Number of times the event occurred Number of total trials Coach Lesson 30

4
**EXPERIMENTAL PROBABILITY!**

Example: A student flipped a coin 50 times. The coin landed on heads 28 times. Find the experimental probability of having the coin land on heads. P(heads) = 28 = .56 = 56% 50 It is experimental because the outcome will change every time we flip the coin. 4 Experimental Probability IXL

5
**PRACTICE EXPERIMENTAL PROBABILITY!**

A spinner is divided into five equal sections numbered 1 through 5. Predict how many times out of 240 spins the spinner is most likely to stop on an odd number. 80 96 144 192 Marilyn has a bag of coins. The bag contains 25 wheat pennies, 15 Canadian pennies, 5 steel pennies, and 5 Lincoln pennies. She picks a coin at random from the bag. What is the probability that she picked a wheat penny? 10% 25% 30% 50%

6
**THEORETICAL PROBABILITY!**

The outcome is exact! When we roll a die, the total possible outcomes are 1, 2, 3, 4, 5, and 6. The set of possible outcomes is known as the sample space. PRACTICE THEORETICAL PROBABILITY! Find the prime numbers of the sample space above– since 2, 3, and 5 are the only prime numbers in the same space… P(prime numbers)= 3/5 = ______% 60 Coach Lesson 29

7
**RATE/ UNIT PRICE/ SALES TAX!**

RATE: comparison of two numbers Example: 40 feet per second or 40 ft/ 1 sec UNIT PRICE: price divided by the units Example: 10 apples for $4.50 Unit price: $4.50 ÷ 10 = $0.45 per apple SALES TAX: change sales tax from a percent to a decimal, then multiply it by the dollar amount; add that amount to the total to find the total price Example 1: $1,200 at 6% sales tax = 6 ÷ 100 = 0.06 x 1,200 = 72 1200 + 72 $1272 Unit Prices IXL COACH LESSON 4

8
PRACTICE SALES TAX! Example 2: Rachel bought 3 DVDs. Using the 6% sales tax rate, calculate the amount of tax she paid if each DVD costs $7.99? $7.99 x 3 = $23.97 $23.97 x 0.06 = $1.4382 Sales Tax = $1.44

9
**We can also use this formula to find time and rate. **

DISTANCE FORMULA! Distance formula: distance = rate x time OR D = rt Example 1: A car travels at 40 miles per hour for 4 hours. How far did it travel? d=rt d=40 miles /hr x 4 hrs d = 160 miles. We can also use this formula to find time and rate. We just have to manipulate the equation. Example 2: A car travels 160 miles for 4 hours. How fast was it going? d = rt 160 miles = r (4 hours) 160 miles ÷ 4 hrs = r 40 miles/hr = r COACH LESSON 23

10
**PRACTICE THE DISTANCE FORMULA!**

DISTANCE = RATE X TIME WITH THIS FORMULA WE CAN FIND ANY OF THE THREE QUANTITIES, RATE, TIME, OR DISTANCE, IF AT LEAST TWO OF THE QUANTITIES ARE GIVEN. If the time and rate are given, we can find the distance: EXAMPLE: How far did Ed travel in 7 hours if he was going 60 miles per/hour? d = rt d = 60miles/hr x 7 hrs d = 420 miles Or if the distance and rate are given, we can find the time: d = rt 420miles = 60 miles/hr x t (420 miles ÷ 60 miles/hr) = 7 hours

11
**PRACTICE USING THE DISTANCE FORMULA!**

Gilda’s family goes on a vacation. They travel 125 miles in the first 2.5 hours. If Gilda’s family continues to travel at this rate, how may miles will they travel in 6 hours? Distance = rate x time 300 miles Michael enters a 120-mile bicycle race. He bikes 24 miles an hour. What is Michael's finishing time, in hours, for the race? d = rt A 2 B 5 C 0.2 D 0.5

12
**RATIOS & PROPORTIONS! Ratio: comparison of two numbers.**

Example: Johnny scored 8 baskets in 4 games. The ratio is 8 = 2 4 1 Proportion: 2 ratios separated by an equal sign . If Johnny score 8 baskets in 4 games how many baskets will he score in 12 games? 1. Set up the proportion 8 baskets = x baskets 4 games games 2. Cross multiply & Divide 4x = 8 ( 12 ) 4x = 96 x = 96 4 x= 24 baskets Ratios Word Problems IXL COACH LESSON 7

13
FRACTIONS! ADDING AND SUBTRACTION – FIND COMMON DENOMINATORS! Use factor trees, find prime factors , circle ones that are the same, circle the ones by themselves. Multiply the circled numbers. EXAMPLE: 5 + 8 12 9 : : 3 x 3 x 2 x 2 = 36 Common denominator = 36 3 x 5 = 4 x 8 = = 47 Least Common Denominator IXL COACH LESSON 1

14
PRACTICE FRACTIONS!

15
**MULTIPLYING & DIVIDING FRACTIONS!**

Multiplying fractions : cross cancel and multiply straight across ¹ 4 X ¹ = 1 ¹ ² Dividing fractions : change the sign to multiply, then reciprocate the 2nd fraction 3 ÷ 5 = 3 X = REDUCE!!! 1 1/5 Multiplying Fractions IXL Dividing Mixed Numbers IXL COACH LESSON 2

16
**PRACTICE MULTIPLYING FRACTIONS!**

3 X 5 6 1 X 7 5 X 5 8 4 9 1 91

17
**Multiplying & Dividing Mixed Numbers!**

When multiplying or dividing mixed numbers, always change them to improper fractions, then multiply. Example 1: 1 ¾ x 1 ½ = x = 21 Example 2: x 2 ½ = 12 x = 60 = 2 5 8 30 Dividing Mixed Numbers IXL

18
**Dividing Mixed Numbers!**

When dividing any form of a fraction, change the division to multiplication, then reciprocate the 2nd fraction. Example: 1 ¾ ÷ 1 ½ = ÷ 3 x = = 11/6 Dividing Fractions IXL

19
**LEAST COMMON MULTIPLE! 2x2x2x3x2x2 = 96**

LCM : Least Common Multiple : the smallest number that 2 or more numbers will divide into Example: Find the LCM of 24 and 32 You can multiply each number by 1,2,3,4… until you find a common multiple which is 96. Or you can use a factor tree: 24: 32: 22 32 2 2x2x2x3x2x2 = 96

20
**GREATEST COMMON FACTOR!**

GCF~ GREATEST COMMON FACTOR : The Largest factor that will divide two or more numbers. In this case we would multiply the factors that are the same. 24: 32: Example: 2x2x2 = 8, so 8 is the GCF of 24 and 32. 22 32 2

21
PRACTICE LCM AND GCF! What is the least common multiple of 3, 6, and 27? A 3 B 27 C 54 D 81 What is the greatest common factor of 12, 16, and 20? A 2 B 4 C 6 D 12

22
PRACTICE LCM AND GCF! What is the greatest common factor (GCF) of 108 and 420 ? A 6 B 9 C 12 D 18 What is the least common multiple (LCM) of 8, 12, and 18 ? A 24 B 36 C 48 D 72

23
**ABSOLUTE VALUE! The symbol for this is | |**

ABSOLUTE VALUE: the number itself without the sign; a number’s distance from zero The symbol for this is | | Example: The absolute value of |-5| is 5 The absolute value of |5| is 5 Absolute Value IXL

24
**PRACTICE ABSOLUTE VALUE!**

If x=-24 and y=6, what is the value of the expression |x + y|? A 18 B 30 C -18 D -30

25
**DISTRIBUTIVE PROPERTY!**

A(B + C) = AB + AC (We distributed A to B and then A to C) Solving 2 step equations: 4(x + 2) = 24 4x = 24 subtract 8 4x = 16 divide by 4 x = 4 Remember when solving 2 step equations do addition and subtraction first then do multiplication and division. This is opposite of (please excuse my dear aunt sally,) which we use on math expressions that don’t have variables. Distributive Property IXL COACH LESSON 20

26
**Associative & Commutative Property!**

Always has parentheses A ( B X C) = B (C X A) FOR MULTIPLICATION A + (B + C) = B + (C + A) FOR ADDITION A X B = B X A FOR MULTIPLICATION A + B = B + A FOR ADDITION Properties for Multiplication IXL Commutative Property for Addition IXL

27
**Stem and Leaf Plots, Box – and – Whisker Plots**

We use stem and leaf plots to organize scores or large groups of numbers. To arrange the numbers into a stem and leaf plot, the tens place goes in the stem column and the ones place goes in the leaf column. Example: We will arrange the following numbers in a stem & leaf plot: 40, 30, 43, 48, 26, 50, 55, 40, 34, 42, 47, 47, 52, 25, 32, 38, 41, 36, 32, 21, 35, 43, 51, 58, 26, 30, 41, 45, 23, 36, 41, 51, 53, 39, 28 Stem 2 3 4 5 Leaf Stem-and-Leaf-Plots IXL COACH LESSON 24

28
**RANGE—The difference between the least and greatest number—is 37.**

MODE—The number that occurs the most often—The mode of these scores– is 41. RANGE—The difference between the least and greatest number—is 37. MEDIAN—The middle number of the set when the numbers are arranged in order—it is 40. MEAN– Another name for average is mean. FIRST QUARTILE OR LOWER QUARTILE —The middle number of the lower half of scores—is 32. THIRD QUARTILE OR UPPER QUARTILE—The middle number of the upper half of scores—is 47. Leaf Lower quartile- 32 Upper quartile- 47 Stem 2 3 4 5 COACH LESSON 27, 25

29
**Box-and-Whisker Plot! First quartile or lower quartile Upper extreme**

Second quartile or median Third quartile or upper quartile Lower extreme Inter quartile Range

30
**PRACTICE STEM & LEAF/ BOX & WHISKERS!**

Make a stem and leaf plot from the following numbers. Then make a box and whiskers diagram. 25, 27, 27, 40, 45, 27, 29, 30, 26, 23, 31, 35, 39 Stem 2 3 4 Leaf 0 5

31
**PRACTICE STEM & LEAF/ BOX & WHISKERS!**

Below are the number of points John has scored while playing the last 14 basketball games. Finish arranging John’s points in the stem and leaf plot and then find the range, mode, and median. Points: 5, 14, 21, 16, 19, 14, 9, 16, 14, 22, 22, 31, 30, 31 26 14 17.5 Range: Mode: Median: Stem Leaf 1 2 3 5 9

32
**Order of Operations! 3 ( 4 + 4 ) ÷ 3 - 2 3 ( 8 ) 3 - 2 24 8 - 2 =6**

3 ( ) ÷ 3 ( 8 ) 24 8 - 2 =6 Note that there are not any variables in the statement. This is why we use order of operation instead of the Distributive Property. COACH LESSON 5

33
**PRACTICE ORDER OF OPERATIONS!**

Karen is solving this problem: (3² + 4²)² = ? Which step is correct in the process of solving the problem? A (3² + 4⁴) B (9² + 16²)² C (7²)² D (9 + 16)² More Practice! 1.) (4 x 3) 2.) 3.) ( ) – ) 64 – 8 + 8 3 + 2(12) 3+ 24 27 -3 -3 -6 36 – 6 30 56 + 8 64

34
**PRACTICE ORDER OF OPERATIONS!**

Simplify the expression below. (6² - 2⁴) · √16 A 16 B 64 C 80 D 108 Order of Operations Math Masters 1.) 2³ = 2 x 2 x 2 = 2.) 3⁴ = 3 x 3 x 3 x 3 = 3.) 4² = 4 x 4 = 5.) √64 = 4.) √144 = 8 12 8 81 16 Order of Operations IXL

35
**FINDING THE MISSING ANGLE OF A TRIANGLE!**

Finding b: Since the sum of the degrees of a triangle is 180 degrees, we subtract the sum of = 115 from = 65 …so Angle b = 65° Finding c: If b = 65 to find c we know that a straight line is 180 degrees so if we subtract 180 – 65 = 115° …so Angle c = 115° Finding a: To find a we do the same thing. 180 – 50 = 130 …so Angle a = 130° a 50° 65° b c Measuring Angles IXL

36
**A B C 30° m<A + 90 + 30 = 180 m<A = 60 °**

Practice finding the measure of <A in the triangle ABC below! A B C 30° m<A = 180 m<A = 60 °

37
**A square has 4 angles which each measure 90 degrees.**

45 D A C B What is the total measure of the interior angles of a square? 360 °

38
**A² + B² = C² Pythagorean Theorem! C² = A² + B² C² = (6)² in + (8)² in**

To find the missing hypotenuse of a right triangle, we use the formula… A² + B² = C² Hypotenuse Height = 6 in Base = 8 inches C² = A² B² C² = (6)² in + (8)² in C² = in² in² C² = in² √C²= √100 in² C = in² Pythagorean Theorem MathMasters

39
**A = base x height 2 AREA OF A TRIANGLE! Area = base x height 2**

A = 10in x 8 in A = in² A = in² Height= 8 in Base= 10 in Definition of height is a line from the opposite vertex perpendicular to the base. Area of Triangles & Trapezoids IXL COACH LESSON 12

40
**Area = ½ bh A = ½ (2ft)(4ft) A = ½ 8ft A =4 ft²**

PRACTICE FINDING THE AREA OF A TRIANGLE! AREA = ½ (BASE X HEIGHT) A = ½ bh Area = ½ bh A = ½ (2ft)(4ft) A = ½ 8ft A =4 ft² Height= 4 ft Base= 2 ft

41
**FINDING THE AREA OF A PARALLELOGRAM!**

b Area = b x h

42
**AREA OF A RECTANGLE & A SQUARE!**

Area of a RECTANGLE = Length x Width Area of a SQUARE = Side x Side Example: 2ft 2ft 4ft 2ft A = l x w A = s x s A = 4ft x 2ft A = 8ft² A = 2ft x 2ft A = 4ft² 8ft² 4ft² Area of Rectangles Parallelograms IXL

43
**CALCULATING PERIMETER!**

PERIMETER IS THE OUTER DISTANCE AROUND A FIGURE. 9 FT 3FT P = a + b + c + … P = 9FT + 9FT + 3FT + 3FT P = ____ FT 27

44
**CALCULATING PERIMETER AND AREA OF COMPOUND FIGURES!**

To find the area of a compound figure, we simply have to find the area of both figures, then add them together. 6FT AREA = LENGTH X WIDTH A = 2FT X 6FT A = 12FT² AREA = LENGTH X WIDTH A = 3FT X 5FT A = 15 FT² 2FT 7FT 3FT TOTAL AREA = 12FT² + 15FT² = 27FT²

45
**CONGRUENT ANGLES & CONGRUENT SIDES!**

Congruent angles and sides mean that they have the same measure. Use symbols to show this! Complementary Supplementary Vertical & Adjacent Angles IXL

46
**Complementary angles : angles whose sum equals 90 degrees **

Supplementary angles: angles whose sum equals 180 degrees Right angle: angle measures 90 degrees ---symbol Acute angle: angle less than 90 Obtuse angle: angle greater than 90 degrees Congruent: when two figures are exactly the same Similar: when two figures are the same shape but not the same size Regular: when a figure has all equal sides Line of symmetry: when a line can cut a figure in two symmetrical sides COACH LESSON 17

47
**Parallel lines: lines that never touch--- symbol**

Perpendicular lines: lines that intersect---symbol Skew lines: lines in different planes that never intersect Plane: a flat, 2-Dimensional surface, formed by many points A point (0-Dimension); A line (1-D); A plane (2-D); A solid (3-D) Vertical angles: angles that share a point and are equal Adjacent angles: are angles that are 180 degrees and share a side COACH LESSON 18

48
**RECOGNIZING ADJACENT ANGLES!**

Adjacent Angles: Angles that share a common side. In the figure below: ANGLES 3 AND 4 ARE ADJACENT ANGLES. ANGLES 2 AND 3 ARE ALSO ADJACENT ANGLES. What are some other adjacent angles? 2 3 1 4 Complementary Supplementary Vertical Adjacent Angles IXL

49
**REVIEW: CLASSIFYING LINES!**

Supplementary angles: sum is 180 degrees Complementary angles: sum is 90 degrees Straight angle: equal to 180 degrees Complementary Supplementary Vertical & Adjacent Angles IXL

50
**PRACTICE GEOMETRY! Circle One: A .) 4 B .) 3 C .) 2 D .) 1 Circle One:**

What is the total number of lines of symmetry that can be drawn on the trapezoid below? Circle One: A .) 4 B .) 3 C .) 2 D .) 1 Which figure below correctly shows all the possible lines of symmetry for a square? Circle One: A.) Figure 1 B.) Figure 2 C.) Figure 3 D.) Figure 4 Symmetry IXL

51
**Calculating Volume of a Quadrilateral!**

Volume = l x w x h [Volume= units³ or cubed units] 4 ft 3 ft 5 ft V = 5ft x 3ft x 4ft = 60ft³ Volume IXL

52
**Identifying Similar Figures!**

Two figures are similar if they have exactly the same shape, but may or may not have the same size. The symbol is ≈ For example: ∆ ABC ≈ ∆ XYZ Which angle is similar to angle B? Angle: _______ X Y Z Y A B C

53
**Diameter: distance across the center of the circle (double radius) **

Chord: line that cuts the circle and does not go through the center of the circle Diameter: distance across the center of the circle (double radius) Radius: the distance half way across the circle ( ½ diameter) Segment: the area of a circle in which a chord creates Sector: a pie-shaped part of a circle made by two radii Circumference: distance around the outside of the circle Arc: a connected section of the circumference of a circle COACH LESSON 15

54
**Central angles: angles in the center of the circle formed by two radii**

Inscribed angles: angles on the inside of the circle formed by two chords COACH LESSON 15

55
**PRACTICE FINDING THE CIRCUMFERENCE OF A CIRCLE!**

If the circumference of a circle s 16Π, what is the radius? Hint: C= 2Πr A 4 B 8 C 16 D 32

56
**PRACTICE FINDING THE AREA OF A CIRCLE!**

If the diameter of a car tire is 30 cm, what is the area of that circle? Round your answer. Hint: Area = Π x r² *USE ∏= 3.14 A 30.14 cm² B 314 cm² C 7,070 cm² D 707 cm²

57
MORE PRACTICE! A duck swims from the edge of a circular pond to a fountain in the center of the pond. Its path is represented by the dotted line in the diagram below. What term describes the duck's path? A chord B radius C diameter D central angle

58
**Adding Negative Numbers!**

Rules: Negative + Negative = Negative = -7 Positive + Positive = Positive 4 + 3 = 7 Negative + Positive = ? (Keep the sign of the larger integer & subtract) = -1 Add & Subtract Integers IXL

59
**Multiplying & Dividing Negative Numbers!**

Rules: Negative x Negative = Positive Negative ÷ Negative = Positive -4 x -2 = ÷ -2 = 2 Positive + Positive = Positive Positive ÷ Positive = Positive 4 x 2 = ÷ 2 = 2 Negative x Positive = Negative Negative ÷ Positive = Negative -4 x 2 = ÷ 2 = -2 Multiplying & Dividing Integers IXL

60
**Comparing & Ordering Integers!**

NEGATIVE POSITIVE Negative integers further to the left of zero have less value. Positive integers further to the right of zero have greater value. Example: -3 IS GREATER THAN -6 COACH LESSON 3

61
**Use the following symbols for inequality number sentences: **

Inequalities! Use the following symbols for inequality number sentences: < less than < 2 ≤ less than or equal to 3 ≤ 4 > greater than 6 > 3 ≥ greater than or equal to -5 ≥ -6 One-step Linear Inequalities IXL

62
**Solving One-Step Equations!**

To solve for a variable in an equation, the variable must be alone on one side of the equals sign. Use a model or an inverse operation to solve a one step equation. Example: 3x = 24 Step 1: Divide by 3 3x = 24 on both sides of the equation x = 8 Two-step Linear Equations IXL COACH LESSON 21

63
**Modeling Mathematical Situations!**

We can translate math sentences to numbers and symbols only Examples: Translate: “five more than” (5 + n) Translate: “three times a number” (3 x n, or 3n) When you combine both: “five more than three times a number” 5 + 3n or 3n +5 COACH LESSON 22

64
**Functions! Functions: inserting a value in for x to find y or f(x)**

Example: f(x) = 2x If x = 2 Then f(x) = 2 (2) + 4 f( x) = 4 + 4 f(x) = 8 So y = 8 A function is when we put a value in and get an answer out. Evaluating Functions IXL COACH LESSON 20

65
Scientific Notation! (This means to move the decimal six places to the right.) Scientific notation x 10⁶ 4.057 x 10⁶ becomes 4,057,000 Expanded notation numbers written using powers of 10 Example: 4,234 = (4 x 10³) + (2 x 10²) + (3 x 10¹) + (4 x 10⁰) = 4,234 Any number raised to the zero power equals ⁰ = 1 Any number raised to the 1st power equals that number ¹ = 8

66
**METRIC SYSTEM & CONVERSTION!**

Kilo Hecto Deka Meter Liter Gram Deci Centi Milli START at the unit you currently have, then move the decimal to the unit you’re looking for. Example 1: 4 kilometers = meters Example 2: 36 millimeters = 3.6 centimeters COACH LESSON 11

67
**PRACTICE UNIT CONVERSIONS!**

The students in a math class measured and recorded their heights on a chart in the classroom. Keith’s height was 1.62 meters. Which is another way to show Keith’s height? A 0.162 cm B 16.20 cm C 162 cm D 1,620 cm A drawing of the Greensburg Airport uses a scale of 1 centimeter = 300 meters. Runway A is drawn 12 centimeters long. How many meters is the actual length of the runway? F 300 G 360 H 3,000 J 3,600

68
**Weight Unit Conversions!**

Use the chart and move the decimal point. Gram = weight Meter = distance Liter = volume For U.S. Customary measurement, conversions are on PSSA charts provided during testing time.

69
**PRACTICE WEIGHT UNIT CONVERSIONS!**

Which of the following is a metric unit for measuring mass? A meter B liter C pound D gram The flower box in front of the city library weighs 124 ounces. What does the flower box weigh in pounds? *Hint: 1 pound = 16 ounces A 7 ½ B 7 ¾ C 868 D 1984

70
**PRACTICE MORE UNIT CONVERSIONS!**

A scientist measures the mass of a rock and finds that it is 0.16 kilogram. What is the mass of the rock in grams? A 1.6 grams B 16 grams C 160 grams D 1,600 grams

71
**Unit Multipliers! Always list the conversion.**

Identify the correct multiplier. Set up the multiplication problem with units being opposite (top & bottom) Multiply & Simplify For example: Change 240 feet to yards First list the conversions: 3 feet OR 1 yard 1 yard feet Since we want yards multiply by 1 yard 3 feet So 240 feet x 1 yard 1 3 feet Then 240 feet = 80 yards COACH LESSON 9

72
**Ratios & Proportions: A ratio is a comparison between two numbers.**

Two ratios separated by an equals sign is called a proportion. To solve a proportion, we cross multiply and divide. Example: 4 = 2 5 = x 4x = 10 x = 10 x = 2 ½ Ratios IXL COACH LESSON 7

73
**Rational & Irrational Numbers**

An Irrational Number is a real number that cannot be written as a simple fraction. A Rational Number can be written as a simple fraction. Irrational means not Rational. Example: 7 is rational, because it can be written as the ratio 7/1 Example (3 repeating) is also rational, because it can be written as the ratio 1/3

74
**Practice Irrational Numbers!**

Which of these is an irrational number? A -2 B √56 C √64 D 3.14 Which of these is an irrational number? A √3 B -13.5 C 7 11 D 1 √9

75
**Converting Rational Numbers!**

Fraction Decimal Percent Place number over its place value and reduce Divide by 100 Multiply by 100 75 = 3 0.75 0.75 x 100 = 75% 125 = 1 0.125 0.125 x 100 = 12.5% 150 = 3 = 1 ½ 1.50 1.50 x 100 = 150% COACH LESSON 4

76
**Points on a Coordinate Grid!**

Ordered pair: [3, 2] 3 is x value and 2 is y value Quadrant II Quadrant I Point of Origin [0, 0] Quadrant III Quadrant IV COACH LESSON 16

77
Scaling! A scale is the ratio of the measurements of a drawing, a model, a map or a floor plan, to the actual size of the objects or distances. Example: An architect’s floor plan for a museum exhibit uses a scale of 0.5 inch = 2 feet. On this drawing, a passageway between exhibits is represented by a rectangle 3.75 inches long. What is the actual length of the passageway? To find an actual length from a scale drawing, identify and solve a proportion. Drawing = Drawing Actual Actual Let p = the actual length in feet of the passageway Use cross products to solve the proportion 0.5 = 3.75 p 0.5 x p = x 0.5 p = 7.5 p = 15 Scale & Indirect Measurement MathMaster COACH LESSON 14

78
**SOLVING PROBLEMS USING PATTERNS!**

Example: Erin is collecting plastic bottles. On Monday she has 7 bottles, on Tuesday she has 14 bottles, on Wednesday she has 21 bottles, and on Thursday she has 28 bottles. If the pattern continues, how many bottles will she have on Friday? Notice the pattern: 7, 14, 21, 28 Write the different operations that you can perform on 7 to get 14. = 14 7 x 2 = 14 Check these operations with the next term in the pattern. c) = 21 d) 14 x 2 = 28 Find the next term in the pattern to determine how many bottles Erin will have on Friday. = 35 COACH LESSON 19

79
Estimation! Estimating involves finding compatible numbers that will make the numbers easier to operate. Leo’s yearly salary is $51,950. Estimate how much money Leo makes in one week. $51,950 is about $52,000. Divide the compatible numbers. $52,000 divided by 52 = $1,000 COACH LESSON 10

80
**Histogram is a bar graph without the spaces between the bars.**

Bar graphs have spaces to show differences in data. Interpret Histograms IXL COACH LESSON 26

81
**Double and Triple Bar & Line Graphs are used to show two sets of related data.**

COACH LESSON 25

82
Making Predictions! We can use trends or patterns seen in graphs to make predictions. COACH LESSON 31

83
**Continue Studying & Good Luck!!!**

Similar presentations

Presentation is loading. Please wait....

OK

CALENDAR.

CALENDAR.

© 2017 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Ppt on non ferrous minerals and rocks Ppt on aircraft landing gear system Ppt on non conventional source of energy Ppt on cells and batteries Ppt on election commission of india Mems display ppt on tv Ppt on transport management system Ppt on new york stock exchange Lcos display ppt online Ppt on water our lifeline