Show:
Dividing
Reducing
Adding
Subtracting
Multiplying
100

4/8 ÷ 3/7

28/24 or 6/4

100

4/8

1/2

100

3/21 +1/7

3/21 + 3/21 = 6/21

or 2/7

100

3/4 - 1/14

19/28

100

1/2 x 1/10

= 1/20

200

3/5 ÷  3/7

7/5

200

2/4

1/2

200

5/8+2/4

9/8

200

3/4 - 1/14

19/28

200

1/2 x 1/3

1/6

300

2/7 ÷  6/9 

= 9/21

300

10/30

1/3

300

10/55 + 3/11

33/55 or 3/5

300

5/6-14/36

17/54

300

4/6 x 1/9

2/27

400

3/4÷ 7/16 

=12/7

400

9/21

3/7

400

13/41+16/82

42/82 or 21/41

400

9/10-10/20

18/20-10/20 = 8/20 or 2/5

400

4/7 x 17/18

= 68/126

500

4/9 ÷  3/4

=16/27

500

55/60

11/12

500

15/14+4/7

15/14+8/14 = 23/14

500

2/5-1/9

18/45 - 5/45 = 13/45

500

1/3 x 5/7

= 5/21