What are the Divisibility Rules?

The divisibility rules are ways to determine or test if a number is divisible by the numbers 2, 3, 4, 5, 6, 8, 9, and 10. For example, to see if 81 is divisible by 3, you would add the digits 1and 8 to get 9 and see if this sum is divisible by 3. Since it is, then 81 is divisible by 3. There are specific rules for each of the numbers listed above. You can find more information here: