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Add fractions with uncommon denominators
Subtract fractions with common denominators
Subtract fractions with uncommon denominators
100

2/5 X 3/4

6/20

100

2/3 +1/3

3/3

100

2/4 +  1/2

4/4

100

3/9 - 2/9

1/9

100

6/7 - 1/2

5/14

200

6/8 X 2/3

12/24

200

2/6 + 3/6

5/6

200

6/20 + 3/4 

21/20

200

7/10 - 4/10

3/10

200

5/6 - 2/3

1/6

300

4/5 X 5/7

20/35 

300

8/20 + 9/20

17/20

300

9/12 + 4/8

30/24

300

10/ 13 - 6/13

4/10

300

2/3 - 11/33

11/33
400

10/20 X 7/ 8

70/ 160

400

9/25 + 12/25

21/25

400

5/9 + 7/27

22/27

400

20/30 - 5/30

5/30

400

4/6 - 10/18 

2/18

500

2/12 X 3/6

6/ 72
500
13/ 25 + 8/ 25

21/25

500

4/5 + 1/2

13/10

500

18/25 - 3/25

15/25

500

7/8 - 4/7

17/56