Page 167 - NUMINO TG_5A

Activity 3 Multiplying Fractions

jOb ective Learn how to multiply fractions.

1. Textbook Instructions Activity 3 Multiplying Fractions

This activity will refresh students on how to 1 . Multiply. Have students practice multiplying fractions. Remind them that they can simplify the
fractions as shown in the example.

multiply multiple fractions, and will take into Example a. 2 3 4 = 2
3 4 5 5
account the simplifying and factoring methods
3 1
already taught in the unit. Solve the example 1 2 4 = 1 3
2 3 2 2 4
with students. 1 3

Example: 1 2 3 = 1 1 31
2 3 4 1 3 4
1

Step 1: Check for common factors. = 1
4

The number 2 can be factored out of

both 1 and 2 . b. 2 3 4 5 =1 c. 6 5 4 3 = 3
2 3 3 3 4 5 6 7 6 5 4 7

113
134

Step 2: Check for further factors. The 3 can

be factored out of both 1 and 3 .
3 4
111

114

Step 3: Multiply

1111 d. 1 2 5 8 = 1 e. 1 2 3 9 = 1
1144 2 5 8 11 11 234 10 10

1. Have students practice multiplying
fractions by solving the problems.

94

2. Build Understanding

For students who are having difficulty, explain to them several ways to simplify this process.
Factoring is much like dividing. If the numbers can be divided by the same number with no remainder, they
can be factored by that number.
If the numbers are the same, they can be factored down to 1.
Never attempt to factor two numerators or two denominators. Only one numerator and one denominator
can be factored together.

150 NUMINO Teacher s Guide