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What is the gcf of 18 and 8 and 21?

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Anonymous

∙ 10y ago
Updated: 8/21/2019

The GCF is 1.

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Wiki User

∙ 10y ago
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The GCF of 18 and 21 is 3.The prime factorization of 18 is 2*3*3The prime factorization of 21 is 3*7So the GCF of 18 and 21 is 3.You can also notice that the difference between 21 and 18 is 3. The GCF can be no larger than the difference between the numbers. Since 3 is a factor of both 18 and 21, it is the GCF.The GCF is 3.3


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