Find A Common Denominator
Add Fractions with Unlike Denominators
Subtract Fractions with Unlike Denominators
100

Find a Common Denominator:

2/4 + 1/2 

Common Denominators Include:

4, 8

100

Add the Fractions:

1/2 + 1/4 =

 3/4

100

Subtract the fractions:

3/4 - 1/2 =

1/4

200

Find a Common Denominator:

1/3 + 2/12 

Common Denominators Include:

12, 36

200

Add the Fractions:

1/5 + 5/10 =

 7/10

200

Subtract the Fractions:

2/5 - 1/10 =

3/10

300

Find the Common Denominator:

8/15 - 1/3

Common Denominators Include:

15, 30, 45

300

Add the Fractions:

1/2 + 4/10 =

 9/10

300

Subtract the Fractions:

1/2 - 2/5 =

1/10

400

Find the Common Denominator:

6/7 - 1/2 =

Common Denominators Include:

14, 28, 42

400

Add the Fractions:

1/4 + 5/10 =

15/20 or 3/4

400

Subtract the Fractions:

1/3 - 1/4 =

1/12

500

Find the Common Denominator:

5/9 + 2/7 =

Common Denominators Include:

63

500

Add the Fractions:

4/5 + 1/2 =

13/10 or 1 3/10

500

Subtract the Fractions:

1/4 - 1/10 =

3/20