Addition
Subtraction
add/sub
50

2/3 + 1/2

1 1/6 or 7/6

50

2/3 - 1/2

1/6

50

2/3 + 4/6 - 3/6

5/6

100

4/5  + 7/12

1 23/60 or 83/60

100

4/5 -7/12

13/60

100

4/5 + 4/10 -2/10

1 or 10/10

150

2/3 + 4/6 +2/8

1 14/24 or 38/24

150

2/3 - 4/6 - 2/8

2/8

150

2/3 + 4/6 - 2/8

1 2/24 or 26/24

200

9/12 + 2/6

1 1/12 or 13/12

200

9/12 - 2/6

5/12

200

9/12 + 2/6 - 5/12

8/12

M
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