0
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
Still curious? Ask our experts.
Chat with our AI personalities
Blake
Beau
Lao
Add your answer:
Earn +20 pts
What is the greatest common factor of 88 and 72?
The greatest common factor of 88 and 72 is 8.
What is the greatest common factor of 72 and 144?
The GCF of 72 and 144 is 72. Since 72 is a factor of 144, it is automatically the GCF.
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.
What is the greatest common factor of 16 72 and 81?
The greatest common factor of 16 72 and 81 is 1.
What is the greatest common factor of 24 36 72?
The Greatest Common Factor of 24, 36, 72 is 12.
