Stepping Stones Module 7 Review

Subtracting Fractions (related)

100

3/5 - 6/20 =

6/20 

3/5 --> 3x4 / 5x4 --> 12/20 - 6/20 = 6/20

200

1/2 -3/8 =

1/8

1/2 --> 1x4 / 2x4 = 4/8 - 3/8 = 1/8

300

4 3/4 - 1 1/2 =

13/4 or 3 1/4

1 1/2 --> 1 2/4

4 3/4 - 1 2/4 = 3 1/4 or 13/4

Subtracting Fractions (unrelated)

100

1/5 - 1/6 =

1/30

LCD: 30

1/5 --> 6/30

1/6 -->5/30

6/30 - 5/30 = 1/30

200

2/3 - 3/8 = 

7/24

LCD: 24

2/3 --> 16/24

3/8 --> 9/24

16/24 - 9/24 = 7/24

300

4 5/9 - 1 2/5 =

3 7/45

LCD: 45

4 5/9 --> 4 25/45

1 2/5 --> 1 18/45

4 25/45 - 1 18/45 = 3 7/45

Subtracting Fractions (regroup)

100

3 1/4 - 1 5/6 =

1 5/12 

LCD: 12

3 1/4 --> 3 3/12 --> 2 15/12

1 5/6 --> 1 10/12 

2 15/12 - 1 10/12 = 1 5/12

200

5 1/5 - 2 2/3 = 

2 8/15 

LCD: 15

5 1/5 --> 5 3/15 --> 4 18/15

2 2/3 --> 2 10/15

4 18/15 - 2 10/15 = 2 8/15

300

6 1/3 - 4 7/8 = 

1 11/24

LCD: 24

6 1/3 --> 6 8/24 --> 5 32/24

4 7/8 --> 4 21/24

5 32/24 - 4 21/24 = 1 11/24 

Subtracting Fractions Word Problem

100

Jacinta bought a bag of apples that weighed 4 1/4 pounds.  She used 2 3/5 pounds of apples in a pie.  What is the mass of the remaining apples?

1 13/20 lbs.

200

Harvey had a piece of pipe that was 5 1/3 feet long.  He used 3 3/8 feet of the pipe to fix a drain.  How much pipe is left?

1 23/24 ft. 

300

Ethan drives 3 3/4 miles to work and Emily drives 2 2/3 miles to work.  How much farther does Ethan have to drive to work?

1 1/2 mi. 

Review Problems

100

345 x 18 = 

6,210

200

15.80 - 7.53 =

8.27

300

Round to the nearest tenth:

1.629

1.6 or 1.600