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What is the greatest common factor of 21 49 63?
The GCF is 7.
What is the greatest common factor of 12 21 and 30?
The greatest common factor of 12 21 and 30 is 3The factors of 12 are: 1, 2, 3, 4, 6, 12The factors of 21 are: 1, 3, 7, 21The factors of 30 are: 1, 2, 3, 5, 6, 10, 15, 30The common factors are: 1, 3The Greatest Common Factor (GCF) is: 3
What is the greatest common factor for 21 and 36?
The factors of 21 are 1, 3, 7, and 21. The factors of 36 are 1, 2, 3, 4, 6, 9, 12, 18, and 36. The factors they have in common are 1 and 3, the largest of which is 3, so 3 is the greatest common factor. Or, you can calculate the greatest common factor by looking at the prime factors. The prime factors of 21 are 3 and 7. The prime factors of 36 are 2, 2, 3, and 3. The prime factors they have in common are a single 3, so 3 is the greatest common factor.
What is the greatest common factor of 14b and 21ab?
The prime factors of 21 are 3 and 7.The prime factors of 14 are 2 and 7.The greatest common factor of 21 and 14 is 7.21ab and 14b also have another factor in common - b. So, the greatest common factor of 21ab and 14b would appear to be 7b . However, it is possible that a and 14 share a common factor of 2, in which case the greatest common factor of 21ab and 14b would be 14b.In summary, if a is an even number (i.e. having a factor of 2), the greatest common factor is 14b.If a is not an even number, the greatest common factor is 7b.gcf(21ab, 14b) = 7b.
What expression represents the gcf of 105 and 126?
The expression that represents the greatest common factor (gcf) of 105 and 126 is 3 x 7 but the greatest common factor of them is 21
