Add the missing fraction

Missing tops

100

/10 x /2 = 6/20

6 x 1

200

/7 x /3 =2/21 

1 x 2

300

/6 x /7 = 24/42

4 x 6

400

/8 x /6 = 20/48

5 x 4

500

/8 x /7 = 36/56

6 x 6 

Missing bottoms

100

1/ x 2/ = 2/15

3 & 5

200

4/16 = 1/ x 4/ 

2 x 8 

300

3/ x 6/ = 18/40

5 x 8 

400

6/ x 7/ = 42/81

9 x 9  

500

7/ x 7/ = 49/99

11 x 9