Chapter 7 Multiply Fractions

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# Chapter 7 Multiply Fractions - PowerPoint PPT Presentation

Chapter 7 Multiply 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. or. 2 3. 2 3. 18 =. 18 =. of. X. or. 3 4. 3 4. 3

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Presentation Transcript

Chapter 7

Multiply Fractions

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

or

2

3

2

3

18 =

18 =

of

X

or

3

4

3

4

3

4

3

4

12 =

12 =

20 =

20 =

of

X

of

X

or

Test Prep Lesson 7-1

Math Journal

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

4

Martin is planting a vegetable garden. Each row

is two meters long. He wants to plant carrots

along ¾ of each row. How many meters of each

row will he plant with carrots?

3

4

2 =

x

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?

3

8

3

x

=

5

6

2

=

x

5

6

3 =

x

Test Prep Lesson 7-2

Math Journal

3 X

34

Explain how to use models to find

Include a drawing

Find the product.

1. Write the whole number

as a fraction

3 X

56

2. Multiply the numerators

3. Multiply the denominators

4. Write the product as a mixed number.

Then simplify

Use a model to solve

Test Prep Lesson 7-3

2

3

3

4

X

=

1

3

1

2

X

=

3

5

1

3

X

=

2

3

3

5

X

=

Test Prep Lesson 7-4

Math Journal

There 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

1

2

2

5

3

4

3

8

3

7

1

3

=

=

=

X

X

X

The product of a fraction and another fraction

will be less then either fraction

5

6

2

=

x

5

6

3 =

x

The product of a number greater than 1 and a fraction will be

greater than the fraction and less than the whole number.

Test Prep Lesson 7-5

Math Journal

Explain how you can compare the size of a product to the size

of a factor when multiplying fractions, without actually doing

the multiplication. Include an example.

Test Prep Lesson 7-6

X

3

4

2

1

34

35

2

1

3

5

X

1

2

2

1

12

34

2

1

3

4

X

1

2

2

1

12

38

2

1

3

8

X

1

9

1

1

23

19

1

1

2

3

Test Prep Lesson 7-7

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.

X

X

4

1

1

13

34

14

23

25

3

2

A whole number (greater than one) times a mixed number,

the product will be greater than the mixed number.

X

A mixed number times a mixed number, the product will be

greater than both factors.

X

X

2

1

1

1

3

1

34

14

12

15

12

13

78

18

12

14

6

3

2

3

X

X

X

X

18

13

14

15

14

34

1

2

3

1

2

3

Is the product ____________

Is the product ____________

Is the product ____________

Is the product ____________

Is the product ____________

Is the product ____________

Test Prep Lesson 7-8

Another Way:

Change to improper fraction

One Way:

Use a Model

X

X

13

13

=

=

14

1

14

1

Simplify using Cross Cancelation

X

16

2

12

12

23

13

45

=

1

1

3

=

=

X

X

Multiply using the Distributive Property.

X

X

X

X

12

56

3

2

12

14

4

2

45

34

8 =

10 =

=

=

Test Prep Lesson 7-9