We know even numbers are divisible by 2

We know the last two digits determine whether or not a number is divisible by 4

We know a number must end in 0 or 5 in order to be divisible by 5

We know a number must be even and add up to a number divisible by 3 if the original number is to be divisible by 6

We know if a number's digits add up to a number that is divisible by 9, then the number itself is divisble by 9

WELL BELIEVE IT OR NOT

There IS a way to see if a number is divisible by 7. Can you figure it out?