Adding and Subtracting Fractions with Unlike Denominators

Adding Fractions

100

What is 1/3 + 1/5?

8/15

200

What is 1/5 + 2/7?

17/35

300

What is 3/4 + 2/5?

23/20 or 1 3/20

400

What is 3/4 + 3/8?

36/32 or 1 4/32 or 1 1/8

Subtracting Fractions

100

What is 3/4 - 2/3?

1/12

200

What is 2/3-3/8?

7/24

300

What is 4/6-2/8?

20/48 or 5/12

400

What is 1/3 - 4/20?

8/20 or 2/15

Mixed Numbers

100

What is 2 1/4 + 2/7?

2 15/28

200

What is 2/3 - 1/8?

13/24

300

What is 3 1/6 - 1 1/4

1 22/24 or 1 11/12

400

What is 13 1/3 - 3 4/9?

9 24/27 or 10 9/27 or 10 1/3