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The fact family for 81 has more than 2 factors: 1, 3, 9 are factors: and that is more than two!

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10y ago
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8y ago

Because 1, 3 and 9 are the only integers that divide into 9 evenly with no remainder.

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11y ago

They are squares of prime numbers.

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Q: Why 9 have three factors?
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