Adding and Subtracting fractions

Common Denominators

100

3/9 + 3/9 = ?

6/9 or 2/3

200

3/12 + 3/12 = ?

6/12 or 1/2

300

10/20 + 10/20 = ? 

20/20 or 1 whole

400

3/10 + 2/10 = ?

5/10 or 1/2

Uncommon Denominators

100

1/3 + 3/4 = ?

keep answer improper

13/12

200

1/4 + 2/8 = ?

4/8 or 1/2

300

1/3 + 5/6 = ?

7/6 or 1 1/6

400

9/6 + 2/12 = ?

20/12 or 1 8/12

Mixed numbers

100

1 2/3 - 1/6 = ?

1 3/6 or 1 1/2

200

1 7/8 - 5/8 = ?

1 2/8 or 1 1/4

300

2 3/12 + 1/4 = ?

2 6/12 or 2 1/2

400

4 1/16 + 3 15/16 = ?

 7 16/16  or  8

improper fractions

100

18/12 - 2/12 = ?

16/12 or 1 1/3

200

20/10 - 16/10 = ?

4/ 10 or 2/5

300

14/7 - 2/7 = ?

12/7 or 1 5/7

400

25/20 - 5/20 = ?

20/20 or 1 whole

Random

100

2/4 + 4/8 = ?

8/8 or 1 whole

200

4/6 + 2/6 = ?

6/6 or 1 whole

300

1 2/6 - 2/4 = ?    

10/12 or 5/6

400

12/6 - 4/6 = ?

8/6 or 1 1/3