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To test for divisibility by 9, add up the digits of the number and if that sum is divisible by 9, then 9 divides (that is is a factor of) the original number.

1 + 0 + 0 = 1 which is not divisible by 9, so 9 is not a factor of 100.

The factors of 100 are: 1, 2, 4, 5, 10, 20, 25, 50, 100

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Q: Is 9 a factor of 100?
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