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The GCF of 21 and 72 is 3
Definition: A factor is a divisor - a number that will evenly divide into another number. The greatest common factor of two or more numbers is the largest factor that the numbers have in common.
Method:
One way to determine the common factors and greatest common factor is to find all the factors of the numbers and compare them.
The factors of 21 are 1, 3, 7, and 21.
The factors of 72 are 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, and 72.
The common factors are 1 and 3. Therefore, the greatest common factor is 3.
By inspection:
21 is divisible by 3 and 7 only 72 is divisible by 2, 3, 4, 6, 12, 18, 26, 36
The greatest common factor is 3
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Oh honey, 72 is like a puzzle piece that's been put together a million times. The factors of 72 are 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, and 72. The greatest common factor is the biggest number that can divide both 72 and another number without leaving a remainder. So, the greatest common factor of 72 is 72 itself.
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What are the common factors and greatest common factor of 72?
Oh honey, 72 is like a puzzle piece that's been put together a million times. The factors of 72 are 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, and 72. The greatest common factor is the biggest number that can divide both 72 and another number without leaving a remainder. So, the greatest common factor of 72 is 72 itself.
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