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What is the greatest common factor of 21 and 84?

Updated: 4/28/2022

Wiki User

∙ 7y ago

Best Answer

The GCF of 21 and 84 is 21. Since 21 is a factor of 84, it is automatically the GCF.
It is: 21

Wiki User

∙ 7y ago

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Wiki User

∙ 10y ago

21, because the prime factorization of 84 is 2 x 2 x 3 x 7. The prime factorization of 21 is 3 x 7. The factors that both 84 and 21 have in common are 3 and 7, so 3 x 7=21.

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Wiki User

∙ 15y ago

21.

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What is greatest common factor of 21 and 84?

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