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100

1/2+ 1/2

2/4

100

3/4 -1/4

2/4

100

1/4 =..../12

3/12

100

1/3 + 1/2 

2/6 + 3 /6  =5/6

100

3/4 - 1/2

6/8 - 4/ 8 = 2/8

200

3/5+ 1/5

4/5

200

6/9 - 3/9 

3/9

200

4/7 =...../14

8/14

200

1/3 + 1/4

4/12 + 3/12 = 7/12

200

2/4 - 2/5

10/20 - 8/20 = 2/20

300

2/10 + 7/10

9/10

300

6/11- 1/11

5/11

300

1/2 = ..../10

5 /10

300

1/5 + 2/3

3/ 15 + 10 /15= 13/15

300

3/4 - 2/3

9/12 - 8/12 = 1/12

400

3/12 + 7/12

10/12

400

5/12 - 1/12

4/12

400

 5/10 = ..../30

15/30

400

1/5 + 1/3

3/15 + 5/15 =8/15

400

4/5 - 1/2

8/10 - 5/10 = 3/10

500

9/20+ 9/20

18/20

500

9/10- 3/10

6/10

500

2/3 =...../6

4/6

500

1/2 + 2/4

4/8 +4 /8 =  8/8 =1 

500

1/2 - 2/5

5/10 - 4/10 = 1/10