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100

1/2 + 2/3

7/6

100

2/3-1/4

5/12

100

1/2 x 2/3

2/6 or 1/3

100

1/2 divided by 1/4

2

100

2/4

1/2

200

2/3 + 3/5

19/15

200

4/6-2/3

0

200

1/4 x 3/5 

3/20

200

4/5 divided by 2/3

6/5

200

4/10

2/5

300

2/8 + 1/4

4/8 or 1/2

300

3/14-1/21

7/42 or 1/6

300

2/10 x 4/8

1/10

300

2/10 divided by 8/15

3/8

300

18/20

9/10

400

3/15 + 8/10

30/30 or 1

400

9/10-6/15

15/30 or 1/2

400

15/9 x 3/4

15/12

400

9/10 divided by 12/35

21/8

400

21/70

3/10

500

8/16 + 9/40

116/160

500

13/10-8/25

49/50

500

25/50 x 75/100

3/8

500

7/18 divided by 42/36

1/3

500

39/65

3/5