Page 205 - NUMINO TG_5A

070_G5U13_G6U15_TG 2014.4.18 3:34 PM ˘ ` 188

13Unit Flip It Over

jOb ective Learn how to divide fractions.

1. Textbook Instructions 13 Flip It Over

In this unit students will learn the basics of Jessica bought 9 m of ribbon to wrap her gifts.
dividing fractions using models and 10
reciprocals.
If she needs 3 m of ribbon to wrap one gift, how many
10

First, students will learn how to divide fractions 9
10
with the same denominator. gifts can she wrap with m of ribbon?

What is the length of the ribbon Jessica

purchased? 9 m.
10
How many 1 s go into 9 ? Nine.
10 10

If 1 m of ribbon wraps one gift, how many 9 3
10 10 10
9 Compare the quotients of and 9 3.
gifts does 10 m of ribbon wrap? 9 gifts.

How many 3 s are in 9 ? Three. Divide. 9 3
10 10 10 10
3
If 10 m of ribbon wraps one gift, how many

gifts does 9 m of ribbon wrap? 3 gifts. 1 9
10 10
10
3
There are three 10 s.

Divide. 9 3

1 23 4567 89
There are three 3s.

114

2. Build Understanding

Dividing Fractions with the Same Denominator Dividing Fractions with Different Denominators
Dividing fractions with the same denominator is
the same as dividing whole numbers. If fractions have different denominators, find the
To quickly solve the equations, simply divide the lowest common denominator first. Divide the
numerators. numerators to solve.

188 NUMINO Teacher s Guide Example: 2 1
5 10

The common denominator is 10.

4 1 4 1 4. Therefore, 2 1 4.
10 10 5 10