6.3
It is because... well lets work the problem and see what happens. 63 divided by 0.1 is 63 divided by 1/10. 63 divided by 1/10 is 63 multiplied by 10/1, or 10 63 x 10 is 630. Lets check if its correct. 630 x0.1 ------ 63.0 I hope it makes you understand.
63 / 10 = 6.3
63/10 + 100 = 106.3
90
63
63
9.9
-100/63 ÷ 10/81 = -90/7 or -126/7
9
63 can be evenly divided by 1,3.7,9,21, and 63.
63 divided into 786 = 0.08015267175572519