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GCF of 21 and 51 is 3.
21=3*7
51=3*17

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15y ago

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More answers

Prime Factors

21 = 3 * 7

51 = 3 * 17

Highest Common Factor (HCF) = 3

Least Common Multiple (LCM) = 357

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Wiki User

15y ago
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The GCF is 3.

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Wiki User

8y ago
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Q: Greatest common factor of 51 and 21?
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