Explanation:
you can divide every number by 1
if a number is even you can always divide it by 2
if the number ends in an odd number that isn't 5, you will most likely be able to divide it by 1, 3, or 9
if a number can be divided by 3, it can most likely be divisible by 6 if its an even number
if it ends in 5, you will be able to divide it by 5
if the number is over 10 and ends in a 0 it will be divisible by 10 and/or 5
I hope this helps