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Divisibility rules

You learn rules to check if a number divides by 2, 3, 4, 5, 6, 8, 9 or 10.

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How to work it out

  1. Divisible by 3 or 9: add up the digits (is the sum divisible by 3 or 9?).
  2. Divisible by 5: ends in 0 or 5.
  3. Divisible by 2: even number.
14 + 3 + 5 = 12212 ÷ 3 = 4

Is 248 divisible by 2?

  1. Check the last digit: 8 is even.
  2. So 248 is divisible by 2.
More examples

Is 315 divisible by 3?

  1. Add the digits: 3 + 1 + 5 = 9.
  2. 9 is divisible by 3.
  3. So 315 is divisible by 3.

Is 240 divisible by 5?

  1. The last digit is 0.
  2. Numbers ending in 0 or 5 are divisible by 5.
  3. So 240 is.