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What are some good math division tricks?

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Quick Answer

To tell if a number is evenly divisible by three, add all the digits in it until you arrive at a single digit. For instance, the number 9234 adds up to 18, which adds up to nine. Nine is evenly divisible by three, so 9234 is evenly divisible by three.

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Full Answer

The trick for three also works for nine, except the final number must be evenly divisible by nine. If a number is even, it is evenly divisible by two. The trick for six is a combination of the tricks for two and three: the number must be even and evenly divisible by six when the digits are added up until a single digit is reached. A digit is evenly divisible by five if the last digit is a zero or a five, while a number is evenly divisible by 10 if the last digit is a zero.

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