1, 2, 3, 4, 6, 7, 9, 12, 14, 18, 21, 28, 36, 42, 63, 126, 252
1, 2 and 4.
3 goes into 36 and 63 evenly.
It is: 1
1 and 7.
It is: 7 and 1
1, 3, 7, 9, 21, 63.
1, 3, 9.
4 goes into 63, 15 times evenly with a remainder of 3
63/252 = 0.25 = 25%
63
The only whole number that can do that is ' 1 '.