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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The factors of 637 are: 1 7 13 49 91 637
637 = 7 * 7 * 13 = 72 * 13
What is the smallest whole number you can add to 637 and get all 5's in the answer?
Well, friend, it seems like you got a little mixed up there, but that's okay! When a number is greater than another number, it means it's bigger. In this case, 794 is actually greater than 637. It's all about learning and growing, so don't worry, mistakes are just happy little accidents on the canvas of life.