NAME _____________________________________________ DATE __________________ PERIOD _________
Lesson 8 Reteach
Divide Mixed Numbers
To divide mixed numbers, express each mixed number as an improper fraction. Then divide as with
fractions.
Example 1
3
2
Find 1 −
÷−
.
3
4
3
5
3
2
÷−
=−
÷−
1−
3
4
Write the mixed number as an improper fraction.
3
4
5
4
=−×−
3
3
20
2
= −− or 2 −
9
9
Multiply by the reciprocal.
Simplify.
Example 2
2
1
Find 2 −
÷ 1−
.
3
5
Estimate: 3 ÷ 1 = 3
8
6
2
1
÷ 1−
=−
÷−
2−
3
5
3
Write mixed numbers as improper fractions.
5
8
5
=−
×−
3
5
Multiply by the reciprocal, −
.
6
6
4
Copyright © The McGraw-Hill Companies, Inc. Permission is granted to reproduce for classroom use.
8×5
= −−−−
Divide 8 and 6 by the GCF, 2.
3×6
3
20
2
= −−
or 2 −
9
9
Simplify. Compare to the estimate.
Exercises
Divide. Write in simplest form.
1
3 −−
1
4
1. 2 −
÷−
2
7
1
2 7 −−
6. 2 −
÷−
10
4
1
3
4
5
7
1
3 −−
3
3. 5 ÷ 1 −
7
1
3
4. 2 −
÷−
2
7
3
3
4
1
1 −−
7. 2 −
÷ 3−
8
7
6
4
10. 4 −
÷ 2−
2
1 1 −−
9. 1 −
÷ 1−
3
10
9
9
2
6
5. 5 −
÷ −−
5
1
8 −−
1
2. 9 ÷ 1 −
8
5
2
3
9
1
2
8. 7 −
÷ 1−
2
3
1
4 −−
2
17
7
1
8
3
1
1 1 −−
1 −−
2 −−
11. 5 −−
÷ 1−
12. 2 −
÷ 2−
25
10
9
10
8
4
18
7
23
3
13. Simplify 6 ÷ 4 −
. 1 −−
5
3
2
14. Simplify 4 −
÷ 1−
.
3
4
2
2 −−
3
Course 1 • Chapter 4 Multiply and Divide Fractions
69