1- All numbers are divisible by one.
2- Even numbers.
3- When you add the digits up, sum of the digits are divisible by three.
4-Divisible by two twice.
5- Ending digit has to be five or zero.
6- Divisible by three and two.
8- Divisible by two, three times.
9- Add all the digits up, sum of the digits are divisible by nine
10- Digit has to end with zero.
There is no rule for seven.