Answer :

iGreen
Just multiply those numbers to the top and bottom.

2:

2 * 1 = 2
2 * 4 = 8

2/8

3:

3 * 1 = 3
3 * 4 = 12

3/12

5:

5 * 1 = 5
5 * 4 = 20

5/20

6:

6 * 1 = 6
6 * 4 = 24

6/24

12:

12 * 1 = 12
12 * 4 = 48

12/48

16:

16 * 1 = 16
16 * 4 = 64

16/64

20:

20 * 1 = 20
20 * 4 = 80

20/80

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