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Writing down all the factors of both numbers requires too much time so it is not a good idea to find solution by writing each factor of both numbers.

Method of prime factorization is one of the good methods to find GCF.

Prime factorization is like breaking a number into other numbers, prime numbers, and this factorization is unique. Prime factorization is like a blueprint for numbers.

Prime factorization of 1820 = 22 x 5 x 7 x 13

Prime factorization of 637 = 7 x 7 x 13

7, 13 and 7x13 are common in the prime factorization of both numbers, but 7x13 is the greatest among these numbers. So, 7x13 = 91 is the GCF of 1820 and 637.

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12y ago
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9y ago

The GCF is 91.

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Q: What is the greatest common factor of 1820 and 637?
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