What is the common factor of 21 and 24?

Answer 1

Generally speaking, finding a GCF (Greatest Common Factor) requires the comparison of two numbers. Since you only have one, I assume you want to highest factor of the single number.

Let's go ahead and break 24 into a factor line.

• 24 ÷ 2 = 12
• 12 ÷ 2 = 6
• 6 ÷ 2 = 3
• 3 ÷ 3 = 1

So the highest common factor (HCF/GCF) for 24 would be 2 • 2 • 2 • 3.

Answer 2

21 factors into the primes 3 and 7; 24 factors into the primes 3 and 23. Therefore, the highest common integral factor is 3.

Answer 3

the highest common factor is 3. i am 11 and i know that, sorry you dont know that.

Answer 4

The factors of 21 are: 1, 3, 7, 21

The factors of 24 are: 1, 2, 3, 4, 6, 8, 12, 24

The common factors are: 1, 3

Answer 5

You need at least two numbers to find a GCF.

Answer 6

The GCF is 3.

Answer 7

The GCF is 1.

Answer 8

The answer would be 4.

Answer 9

The GCF is 3.

Answer 10

GCF(24x, 21) = 3