Equivalents
LCD
Quick Addition
(simplest form)
Addition
Subtraction
Conversions
100

Write two equivalent fractions for 2/3

4/6 6/9 8/12 10/15

100

LCD of 1/2 and 3/5

10
100

Add 2/3 + 1/3

If necessary, express your answer as a mixed number.

3/3=1

100

Add the fractions:   2/5 + 5/10

9/10    

100

Subtract the fractions:   3/5  -  3/10

3/10

100

Turn to a mixed number

7/2

3 1/2

200

Write three equivalent fractions for 1/3.

2/6,  3/9,  4/12,  5/15

200

LCD of 7/12 and 3/8

24

200

Add  4/5  + 2/ 5

If necessary, express your answer as a mixed number.

6/5  =  1  1/5

200

Add the fractions:  1/4 + 3/16

7/16

200

Subtract the fractions:  4/7  -  5/14

3/14

200

Turn to a mixed number

13/4

3 1/4

300

Write two equivalent fractions for 1 5/10.

1 1/2,  1 10/20, 1 15/30, 1 20/40

300

LCD of 5/6 and 2/4

12

300

Add  3  3/8 + 5  2/8

If necessary, express your answer as a mixed number.

8   5/8

300

Add the fractions:  2/3 + 5/7

29/21   or   1 8/21

300

Subtract the fractions: 4 2/10  -  5/10

3 7/10 

300

Turn to a mixed number

27/5

5 2/5

400

Write two equivalent fractions for 5/4.

10/8,  15/12,  25/20,  30/24

400

LCD of 3/8, 2/4 and 4/10

40

400

Add 5/16 + 9/16

If necessary, express your answer as a mixed number.

14/16 = 7/8

400

Add the mixed numbers:   2 1/3 + 4 1/2

6  5/6

400

Subtract the fractions: 3 2/14 -  1 2/7

1  3/4

400

Turn to a mixed number

51/10

5 1/10

500

Write two equivalent fractions for 1.

1/1,  2/2,  3/3,  4/4

500

LCD of 2/6, 1/3, and 3/7

42

500

Add 7/20 + 8/20 

If necessary, express your answer as a mixed number.

15/20 = 3/4

500

Add the mixed numbers:  8 1/5  +  1 7/9

9  44/45

500

Subtract the fractions:   1  1/6 - 21/30

7/15

500

Turn to a mixed number

66/7

9 3/7

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