In the example I gave the divisor was 7 so the table is

0 x 7 = 0
1 x 7 = 7
2 x 7 = 14
.
.
.
9 x 7 = 63

That way when you are looking to get as close to the remainder without going over, for watever power of ten, you just just check the table. Very useful when your divisor isn't 7 but something like 6385735