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Find the Least
Common Multiple (LCM)
Find the Least Common Denominator (LCD)
Find an Equivalent Fraction
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100

2:

4:

4

100

1/2 and 1/3

6

100

1/2

2/4, 3/6, 4/8...

100

1/2 + 1/2

2/2 or 1

200

2:

3:

6

200

2/4 and 3/5

20

200
1/4

2/8, 3/12, 4/16...

200

1/2 + 1/3

5/6
300

2:

5:

10

300

4/5 and 1/6

30

300

2/5

4/10, 6/15, 8/20...

300

2/3 + 2/5

16/15 or 1 1/15

400

3:

4:

12

400

5/6 and 1/7

42

400

3/5

6/10, 9/15, 12/20

400

2/5 + 3/4

23/20 or 1 3/20

500

4:

7:

28

500

3/7 and 4/9

63

500

4/7

8/14, 12/21, 16/28...

500

3/7 + 2/5

29/35