10b/15

2^-1 = 1/2
3^-2 = 1/9
(1/2)^-2 = 4
2^-3 = 1/8

12/16
2,4 mld = 2,4 * 10^9
32 tys = 3,2 * 10^4
100mln = 10 * 10^7
400 mln = 4* 10^8
0,000015m = 1,5 * 10^-5
0,00002m = 2 * 10^-5

7/15

12/5 = 2,4
3/8 = 0,375
5/6 = 0,8(3)
32/15 = 2,1(3)
2/7 ~ 0,29
1 8/9 = 1,(8)