63/10 + 100 = 106.3
-100/63 ÷ 10/81 = -90/7 or -126/7
0.63
6.3
0.63
9
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.
1.5873
63 + 10 = 73
10% of 63 = 63*10/100 = 6.3
63 / 10 = 6.3
The factors of 63 are 1, 3, 21 and 63. The factors of 100 are 1, 2, 4, 5, 10, 20, 25, 50 and 100. The only factor they have in common is 1, so it is the only number both can be divided by.