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09Multiply Fractions Unit

CMath Vo abulary unit fraction: a fraction that has 1 as the numerator and a positive number as the denominator

Learn how to multiply fractions.

s. Multiply. 3 1 In this exercise, students will learn how to
4 9 multiply fractions by multiplying the
numerators and then the denominators.

Multiply the numerators. Multiply the 3 1 31 Example: 3 1
denominators. 4 9 49 4 9

Write the fraction in simplest form. 3 1. Multiply the numerators: 3 1
36
2. Multiply the denominators: 4 9
1
12 3. Write the fraction in simplest form.

3131
4 9 36 12

2 . Multiply. Have students show their work.

a. 1 21 b. 1 21
4 9 18 6 39
2. Have students multiply the fractions using

the method above. Have them show their

work. Make sure they reduce by any common

3 51 4 71 factors before multiplying.
10 96 7 82
c. d. Refer to .

Divide the numerators and

e. 2 61 denominators by common factors
12 77
before multiplying them.

This will make it easier to

multiply the fractions.

3 1 1

1 31 11
4 9 4 9 4 3 12

3

9. Multiply Fractions 83

Reduce Before Multiplying

This will save time and make problems significantly easier.

Example: 3 1
4 9

Write the problem as one fraction. (3 1)
(4 9)

Use the common factor 3 to simplify the fraction. (1 1)
(4 3)

Multiply. 1
12

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