Show:
Add - same D
Subtract - Same D
Add - different D
Subtract - Different d
Divide (don't reduce)
100

1/3 + 1/3

2/3

100

4/5 - 3/5

1/5

100

2/5 + 3/10 

7/10

100

3/4 - 1/2

1/4

100

1/2 divide 1/4


4/2

200

2/4 + 1/4

3/4

200

12/13 - 9/13

3/13

200

1/4 + 1/2

3/4

200

7/8 - 1/4

5/8

200

5/7 div 2/3


15/14

300

3/8 + 1/8

1/2

300

3/4 - 1/4

1/2

300

1/6 + 2/3

5/6

300

13/16 - 1/4

9/16

300

3/5 div 2/7


21/10

400

2/4 + 3/4

1 1/4

400

10/12 - 2/12

2/3

400

2/11 + 1/2

15/22

400

17/20 - 2/4


7/20

400

1/6 divide 2/3

3/12

500

7/8 +5/8

1 1/2

500

9/15 - 2/15 - 4/15

1/5

500

1/2 + 3/16

11/16

500

31/36 - 2/9

23/36

500

3/5 divide 2/8

24/10