5th Ch 3 Adding & Subtracting Fractions Review

+/- with Like Denominators

100

3 - 5/8

2   3/8

200

3/8 - 1/8

1/4

300

6  9/10 -  3  7/10

3  1/5

400

2 + 4/12

2 1/3

500

1 - 1/8

7/8

+/- with Unlike Denominators

100

1/4 + 5/8

7/8

200

2/5 + 1/2

9/10

300

7/12 - 1/2

1/12

400

5/6 - 2/12

3/4

500

3/12 - 1/8

1/8

Adding Mixed Numbers with Unlike Denominators

100

4 1/6 + 9 2/3

13 5/6

200

8 1/4 + 8 5/6

17 1/12

300

8 4/6 + 4 3/5

13 4/15

400

8 7/9 + 2 2/3

11 12/27

500

10 5/6 + 8 14/15

19 23/30

Subtracting Mixed Numbers with Unlike Denominators

100

7 3/4 - 1 1/12

6 2/3

200

11 1/2- 7 3/8

4 1/8

300

17  -  8 2/3

8 1/3

400

7 4/5 - 2 9/10

4 9/10

500

9 1/2 - 5 8/12

3 5/6

Benchmarks & More Subtraction

100

Add using Benchmark Fractions"

1/4 + 7/9

1

200

Subtract using Benchmark Fractions

8/15 - 1/5

1/2

300

Add using Benchmark Fractions

1 3/9 + 2 1/8

3 1/2

400

Subtract using Benchmark Fractions

9 1/8 - 4 5/6

4

500

Subtract and check your problem using Benchmark fractions

7 3/8 - 2 4/9 

4 67/72

Benchmark = 7 1/2 - 2 1/2 = 5

Vocabulary for Working with Fractions

100

Answers must be ___________. (Hint: This is the last step you should always complete when working with fractions.)

Simplified

200

12/7 is an example of an _______________. This is not in the simplest form!

improper fraction

300

Fractions must have the same _________ before adding or subtracting. (Hint: This is the 1st step when adding or subtracting fractions)

denominator

400

Use __________ fractions after finding the LCM or common denominator before adding or subtracting. (Hint: This is the 2nd step when adding or subtracting fractions)

equivalent

500

This is the fraction of 5th grade to the total number of upper grades at IRDS

1/5