Chapter 7Multiply Fractions

Lesson 7-1: Find Part of a Group Date

To find a fractional part of a group:

Denominator tells how many equal groups

Numerator tells how many equal groups to circle

“of” means to multiply

23

of 18 = 23

X 18 =

or

34

of 12 = 34

X 12 =

or

34

of 20 =34

X 20 =

or

Test Prep Lesson 7-1Use your clicker to answer the following question:

Lesson 7-2: Multiply Fractions and Whole Numbers Date

Math Journal

Explain how to find 3 of 20 using a model. Include a drawing 4

Martin is planting a vegetable garden. Each rowis two meters long. He wants to plant carrotsalong ¾ of each row. How many meters of each row will he plant with carrots?

34

x 2 =

Margo was helping clean up after a class party. There were 3 boxes. Remaining with pizza in them. Each box had 3/8 of a pizza left. How much pizza was left in all?

38x3 =

56

x 3 = 56 x2 =

Test Prep Lesson 7-2Use your clicker to answer the following question:

Lesson 7-3: Fraction and Whole Number Multiplication Date

Math Journal

Explain how to use models to find

Include a drawing

3 X 34

Find the product. 3 X 56

Use a model to solve

1. Write the whole number as a fraction

2. Multiply the numerators

3. Multiply the denominators

4. Write the product as a mixed number. Then simplify

Test Prep Lesson 7-3Use your clicker to answer the following question:

Lesson 7-4: Multiply Fractions Date

23

34X =

13

12X =

35

13X =

23

35X =

Test Prep Lesson 7-4Use your clicker to answer the following question:

Lesson 7-5: Compare Fraction Factors and Products Date

Math JournalThere is 5/8 of a pizza left. Josh eats ¼ of the left over pizza. How much pizza does Josh eat? Describe how to solve the problem using a model. Include a picture of your model

The product of a fraction and another fraction will be less then either fraction

The product of a number greater than 1 and a fraction will be greater than the fraction and less than the whole number.

25

38X = 3

437X =

12

13X =

56

x 3 = 56 x2 =

Test Prep Lesson 7-5Use your clicker to answer the following question:

Lesson 7-6: Fraction Multiplication Date

Math JournalExplain how you can compare the size of a product to the sizeof a factor when multiplying fractions, without actually doingthe multiplication. Include an example.

Test Prep Lesson 7-6Use your clicker to answer the following question:

Lesson 7-7: Area and Mixed Numbers Date

Area: the number of square units needed to cover a surface. L X W = A

2 34

X1 35

1

35

342

2 12

X1 34

1

34

122

2 12

X1 38

1

38

122

1 23

X1 19

1

23

191

Test Prep Lesson 7-7Use your clicker to answer the following question:

Lesson 7-8: Compare Mixed Number Factors and Products Date

A fraction times a mixed number, the product will be less than the mixed number.

A whole number (greater than one) times a mixed number, the product will be greater than the mixed number.

4 13

X34

1 14

X3

A mixed number times a mixed number, the product will be greater than both factors.

1 23

X252

2 15

X12

3 34

X6

1 78

X132

1 12

X143

1 14

X3

1 18

X12

Is the product ____________13

2

Is the product ____________15

2

Is the product ____________34

3

Is the product ____________14

1

Is the product ____________14

3

Is the product ____________18

1

Test Prep Lesson 7-8Use your clicker to answer the following question:

Lesson 7-9: Multiply Mixed Numbers Date

One Way: Use a Model

Another Way: Change to improper fraction

13

X =1 14

13

X =1 14

Simplify using Cross Cancelation

2 16

X12 =12

1 13

X =

1 23

3 45

X =

Multiply using the Distributive Property.

2 34

X 8 = 4 45

X 10 =

2 56

X12 =3 12

X14 =

Test Prep Lesson 7-9Use your clicker to answer the following question:

Lesson 7-10: Problem Solving: Find Unknown Lengths Date

Test Prep Lesson 7-10Use your clicker to answer the following question: