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.
7
The factors of 637 are: 1 7 13 49 91 637
637 = 7 * 7 * 13 = 72 * 13
Round off to the nearest hundred 637
640
The Greatest Common Factor (GCF) is: 1
The GCF of 468 and 637 is 13.
13 is the greatest common factor of 208 and 637. Factor each number: 208 = 2 x 2 x 2 x 2 x 13 637 = 7 x 7 x 13 The only common factor (and thus, the greatest common factor) is 13.
7
The least common multiple (LCM) of 91 and 49 is 637.
As a product of its prime factors: 7*7*13 = 637
The Least Common Multiple (LCM) for 169 637 845 is 41,405.
The greatest common factor of 208 and 637 is 13.
637
1 and 13
637
One way of writing the factor tree for 6370 is: 6 3 7 0 ^ 637 x 1000 ^ ^ 637 x 2 x 500 ^ ^ ^ 637 x 2 x 5 x 100 ^ ^ ^ ^ 637 x 2 x 5 x 5 x 20 ^ ^ ^ ^ 637 x 2 x 5 x 5 x 5 x 4 ^ ^ ^ ^ ^ ^ 637 x 2 x 5 x 5 x 5 x 2 x 2