Divisibility Rule for 15

If you divide a number by 15 and you get a whole number as an answer (quotient), then that number is divisible by 15.

Instead of simply dividing your number by 15 to see if you get a whole number, you can use what we call the Divisibility Rule for 15.

The Divisibility Rule for 15 is used to determine if a number is divisible by 15. You can also call it the test of divisibility for 15.

For a number to be divisible by 15, the number must end with 0 or 5 AND the sum of its digits must be divisible by 3.

For example, 8,469,225 is divisible by 15 because the last digit is a 5 and 8 + 4 + 6 + 9 + 2 + 2 + 5 = 36 and 36 is divisible by 3.

However, 8,469,325 is not divisible by 15 even if it ends with 5 because 8 + 4 + 6 + 9 + 3 + 2 + 5 = 37 and 37 is not divisible by 3.

Remember, both conditions must be met for the number to be divisible by 15.

Divisibility Rule for 16
Here is the next Divisibility Rule on our list.

Divisibility Rules
Here is a list of all our Divisibility Rules.