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It's very easy to test a number to see if it is divisible by 4 or by 9. If it passes both tests, then it is divisible by 4x9=36.

  • To test for divisibility by 9, add the digits of the number. If the sum is divisible by 9, then the number is divisible by 9.
  • To test for divisibility by 4, look at the last two digits. If they are a multiple of 4, then the number is divisible by 4.
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10y ago

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It's even. All even numbers are divisible by 2.

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10y ago
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If it's even and divisible by 3, it's divisible by 6.

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8y ago
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Q: How do know a number is divisible by six?
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