 # Math 5 Unit Review Instructor: Mrs. Tew Turner. In this lesson we will review for the unit assessment and learn test taking strategies.

## Presentation on theme: "Math 5 Unit Review Instructor: Mrs. Tew Turner. In this lesson we will review for the unit assessment and learn test taking strategies."— Presentation transcript:

Math 5 Unit Review Instructor: Mrs. Tew Turner

In this lesson we will review for the unit assessment and learn test taking strategies.

Math Warm-up Double each of the following. Do them mentally. 1.43 2.27 3.85 (Pause Lesson to work)

Math Warm-up - ANSWER Double each of the following. Do them mentally. 1.43 86 2.27 54 3.85 170 (Pause Lesson to work)

In this unit you learned about fractions. Today we will review all that you have learned, as well as go over test taking strategies.

Vocabulary Review fraction – a symbol, such as ¾, used to describe one or more parts of a whole that is divided into equal parts. A fraction can name a part of a whole, a part of a set, a location on a number line, or a division of whole numbers.

Vocabulary Review numerator - the number above the fraction bar in a fraction denominator - the number below the fraction bar in a fraction 1212 denominator numerator

Vocabulary Review dividend - the number to be divided. 24 ÷ 4 = 6 divisor - the number that a dividend is divided by. 24 ÷ 4 = 6

Vocabulary Review quotient - the number that is the result of dividing. 24 ÷ 4 = 6 6 is the QUOTIENT!

Vocabulary Review Equivalent fractions : have the same value, even though they may look different. Unlike denominator: Unlike denominator is the bottom number in a fraction that is not the same as another fraction. Common denominator: Denominator s must be the same to be common.

Vocabulary Review Greatest Common Factor: The greatest number that is a factor of 2 or more given numbers. Example: 18=2 x 3 x 3 24=2 x 2 x 2 x3 Find the prime numbers! Benchmark fraction: Common fractions used for estimating, such as ½, ¼, ⅓, ⅔, & ¾.

Vocabulary Review Multiple: a number that contains another number repeatedly without a remainder, example 5 is a multiple of 25. Prime: a number that can be divided evenly only by 1 and itself. Composite: a number that can be divided evenly by numbers other than 1 or itself.

Least Common Denominator: (LCD), The least common multiple of the denominators of two or more fractions. Vocabulary Review Least Common Multiple: (LCM), the least number that is a common multiple of two or more numbers.

Vocabulary Review mixed number – a whole number and a fraction Ex.

Vocabulary Review improper fraction – a fraction whose numerator is greater than or equal to its denominator (the fraction is 1 whole or more) Ex.

Fractions as Division Review

Al, Lisa, Nico, and Laura are making a picture. They will share 3 rectangular strips of colored paper. What fraction represents the part of a whole strip of paper each will get? 1 whole Find 3 ÷ 4

One way to divide 3 wholes into 4 equal parts is to first divide each whole into 4 equal parts. Each part is ¼ of a whole. 1 whole Find 3 ÷ 4

Rearrange the quarter pieces so that each person gets 3 of the ¼ pieces. Each gets ¾. Lisa Nico Laura Al

Give each answer as a fraction: 1. 1 ÷ 2 2. 9 ÷ 10 3. 3 ÷ 4

Finding Equivalent Fractions Review

Write 2 equivalent fractions. Use multiplication for one and division for the other.

You can make equivalent fractions by multiplying or dividing both top and bottom by the same amount. You only multiply or divide, never add or subtract, to get an equivalent fraction. Only divide when the top and bottom would still be whole numbers.

Simplifying Fractions Review

Simplifying fractions, also known as, reducing or putting into lowest terms, means to make the fraction as simple as possible. They are still the same or equivalent but written with a different fraction name, as ½ = 2/4. To simplify a fraction, divide the top and bottom by the highest number that can divide into both numbers equally.

Fractions in Simplest Form If a number is a factor of two numbers, it is called a common factor. The greatest common factor (GCF), of 2 numbers is the greatest or largest number that is a factor of both numbers. 4 was the greatest common factor for both 12 & 20. 2 is a factor but we still did NOT have simplest form until we divided it by 4 (the largest factor).

Simplify the fraction.  common factor = common multiple 4 ÷ 2 = 2 10 2 5 3 (Is this fraction in simplest form?) 5 Can the numerator & denomInator be divided by a whole number? Simplest Form YES (It was not in simplest form as it could be divided by ‘2’ for both the numerator & denominator.) NO

Greatest Common Factor The greatest common factor (GCF), of 2 numbers: 20 & 30 20: 1, 2, 4, 5, 10, 20 30: 1, 2, 3, 5, 6, 10, 15, 30 The GCF of 20 & 30 is 10. Or 10 is a multiple of both numbers.

Fractions in Simplest Form Guided Practice

When you don’t know the equivalent fraction to use when adding or subtracting fractions with unlike denominators you will have to change one or all the fractions to share a common denominator.  Find the common denominator we need to find the least common multiple or the least common denominator to do this.

1.Find the common denominator This just means all the fractions have the same denominator. Why is this important to adding and subtracting fractions? Before you can do these operations the fractions must share a common denominator.

2. Find the least common denominator. This is the same as finding the least common multiple of the denominators. As ¼ =2/8 (4 is a multiple of 8) Find the LEAST (smallest) common multiples of both denominators to see what can be the shared denominator.

Example of Least Common Multiple 1/3 List the multiples of 3 : 3, 6, 9, 12, 15, 1/6 List the multiples 6 : 6, 12, 18, 24, … The least common multiple is 6. Now what do you do?

Example of Least Common Multiple 1/3 List the multiples of 3 : 3, 6, 9, 12, 15, 1/6 List the multiples 6 : 6, 12, 18, 24, … The least common multiple is 6. Now what do you do? 1 = 2 (What was multiplied by both the 3 6 numerator and denominator to get 2/6? 2 was.) 1x 2 =2 3x 2 = 6

What Did We Do? The trick was to list the multiples of each denominator, then find the Least Common Multiple! Easy as....

The Steps! Here are the steps to follow: Find the Least Common Multiple of the denominators (which is called the Least Common Denominator ). Change each fraction (using equivalent fractions)equivalent fractions to make their denominators the same as the least common denominator. Then you add (or subtract) the fractions, as you wish!

Mixed Numbers and Improper Fractions Review

You know that 20 ÷ 9 = 20 9 This is an improper fraction because the numerator is greater than the denominator. Improper fractions can be rewritten as mixed numbers!

You can write 20 ÷ 9 as a mixed number. You know that 20 ÷ 9 = 20 9 Step 1: Divide the numerator by the denominator. 9 20 18 2 2

You can write 20 ÷ 9 as a mixed number. You know that 20 ÷ 9 = 20 9 Step 2: Write the remainder as a fraction. 9 20 18 2 2 The divisor is the denominator! 2 2929

Write as an improper fraction. 2 2929 Step 1: Multiply the denominator of the fraction by the whole number. x 2 x 9 = 18 2 2929

Write as an improper fraction. 2 2929 Step 2: Add the numerator of the fraction. 2 2929 x 18 + 2 = 20 +

Write as an improper fraction. 2 2929 Step 3: Write using the same denominator. 20 9 2 2929

Write as an improper fraction. 2 2929 2 2929 = 20 9

Write the improper fraction as a mixed number, or the mixed number as an improper fraction. 1. 2. 3 3838 25 4

Adding and Subtracting Mixed Numbers and Improper Fractions Review

What is 2 + 3 ? 3434 1212 Step 1: Convert to improper fractions 2 3434 x + 3 1212 x + = = 11 4 7272

What is 2 + 3 ? 3434 1212 = x2 11 4 7272 Step 2: Convert fractions to have common denominator (if needed) LCM: 4- 4,8,12 2- 2,4,6 x2 14 4

What is 2 + 3 ? 3434 1212 = 11 4 14 4 Step 3: Add the numerator because it is an addition problem. + 25

What is 2 + 3 ? 3434 1212 = 11 4 14 4 + 25 4 Step 4: Write the new numerator over the denominator

What is 2 + 3 ? 3434 1212 25 4 25 ÷ 4 = 6 r. 1 1 4 6 Step 5: Write the improper fraction as a mixed number

What is 2 + 3 ? 3434 1212 1 4 6 Step 6: Simplify the fraction This is already in simplest form.

Using Benchmark Fractions to Estimate Review

Which benchmark is nearest? 3838

3838 3/8 is less than ½ because it is less than 4/8. 3/8 is greater than ¼ because it is greater than 2/8. In fact, it is halfway between ¼ and ½.

How can benchmarks help you estimate the sum of two fractions? Think about it with this problem. 1212 5858 + Is the sum between 0 and 1 or between 1 and 2?

1212 5858 + Since 5/8 is greater than ½, the sum would be between 1 and 2.

Quick Check Estimate the sums and describe your thinking.

Word Problems Review

Lesson Review When working on Word Problems: Read each problem twice, twice. Underline key words. Underline the information you need to solve a problem. Circle any data that is provided. Choose your solution strategy. Solve and show your work. Check your answer.

Hoping to be named Salesperson of the Month, Braden called the names from 2 2/5 pages of the phone book last week. This week, he called the people listed on another 5 2/5 pages of the same phone book. How many pages worth of people did Braden call in all? In your Math Notebook Independent Practice

Test Taking Strategies (Write these in your Math Notebook) Read each problem twice. Underline key words. Underline the information you need to solve a problem. Circle any data that is provided.

Test Taking Strategies (Write these in your Math Notebook) Solve the problem. Show your work as you solve the problem. Check your work. Use estimation to check if your answer is reasonable.

Today you reviewed for the unit assessment and learned about test taking strategies. Good Work with this lesson.

Download ppt "Math 5 Unit Review Instructor: Mrs. Tew Turner. In this lesson we will review for the unit assessment and learn test taking strategies."

Similar presentations