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09Multiply Fractions Unit

Objective: Learn how to multiply fractions.

Relate multiplication to repeated addition. Have students solve the problems using the method shown in the In this exercise, multiplication problem is solved
through repeated addition.
example.

Learn how to multiply 4 by 2 . Write the correct numbers in the blanks.
3

Example: 4 2
3
2 2 2 2 2 2 2
4 3 3 3 3 3 4 3 is the same as adding 3 four times. Explain to students that 4 2 is the same as
3
42 adding 2 , 2 , 2 and 2 .
42 It can be written as 3 . 33 3 3

3 Rewrite the improper fraction as a mixed This is the same as (4 2) 8.
number. 3 3
2
2 Rewrite the improper fraction 8 as the mixed

3

2 3
3
number 2 .

Fill in the blanks.

5 1 1 1 1 1 1 5111 12 5 1 Have students fill in the blanks to solve each
2 2 2 2 2 2 2 multiplication problem using the method shown
2 2 in the example.
2

4 2 2 2 2 2 4111 22 8 3
5 5 5 5 5 5
5 1
5

3 3 3 3 3 3111 32 9 1
4 4 4 4 4
4 2
4

4 5 5 5 5 5 4111 52 20 6
7 7 7 7 7 7 2
7
7

9. Multiply Fractions 79

For students who are having difficulty visualizing how fractions work, have

them pretend they’re dividing a pizza into 12 slices.

Problem: 1. If one student eats 1 of a pizza, how many slices will he eat?
6

2. If one student eats 6 slices, what fraction of the pizza did he eat?

Answer: 1. 2

2. 1
2

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