Division

How can you tell if a number is divisible by 2?

If it’s even, ending in 0,2,4,6 or 8.

How can you tell if a number is divisible by 3?

If the sum of it’s digits is divisible by 3.

How can you tell if a number is divisible by 4?

If it’s divisible by 2 twice.
If half the number is even.
If the last two digits are 0s.
If the last two digits can be divided by 4 (for example 216, 832).

How can you tell if a number is divisible by 5?

If it ends in 0 or 5.

How can you tell if a number is divisible by 6?

If it is divisible by 2 and by 3.
If it’s an even number and the sum of the digits is a multiple of 3

How can you tell if a number is divisible by 8?

If the last 3 digits are 0s.
If the last three digits can be divided by 8 (for example 1,160).

How can you tell if a number is divisible by 9?

If the sum of digits is divisible by 9 (just like 3).

How can you tell if a number is divisible by 10?

If the number ends in 0.

How can you tell if a number is divisible by 11?

If all the digits are the same and it has an even number of digits.