Show:
adding fractions
subtracting fractions
Adding and Subtracting
proper/improper fraction
100

what is 

2/5+10/5

12/5

100

10/12-3/12

7/12

100

9/7-6/7=

3/7

100

10/3

improper

200

7/11+ 2/11

9/11

200

6/11-4/11

2/11

200

10/20+14/20=

24/20

200

1/2

proper

300

11/13 + 12/13

23/13

300

20/20-5/20

15/20

300

13/5-3/5=

10/5

300

5/10

Proper

400

11/12 + 11/12

22/12

400

8/12-4/12

4/12

400

18/10-8/10=

10/10

400

24/5

improper 

500

8/10 + 5/10

13/10

500

7/13-2/13

5/13

500

1/2+11/2

12/2

500

30/12

improper