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If you know the rules of divisibility, you can tell if a number is divisible by another number by looking at it. A number is divisible...

by 2 if it's even.

by 3 if the sum of its digits is a multiple of 3.

by 4 if the last two digits are a multiple of 4.

by 5 if it ends in a 5 or 0.

by 6 if it's divisible by 2 and 3.

by 8 if the last three digits are divisible by 8.

by 9 if the sum of its digits is a multiple of 9.

by 10 if it ends in a 0.

There is a rule for 7, but it's annoyingly complicated, hard to remember and takes as long to implement as actually dividing by 7.

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โˆ™ 2013-05-15 18:47:12
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Algebra

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