What is the greatest common factor of 12 and 20 and 24?

Answer 1

The GCF of 12, 20, and 24 is 4.

There are two ways to find the answer here:

First Method Begin by listing the factors (whole numbers that can be multiplied together to equal the number). E.g.: 3 x4=12, therefore both 3 and 4 are factors of 12.

12: 1, 2, 3, 4, 6, 12

20: 1, 2, 4, 5, 10, 20

24: 1, 2, 3, 4, 6, 8, 12, 24

The largest factor that all three numbers share is 4, therefore the Greatest Common Factor of 12, 20, and 24 is 4.

Second Method List the prime factorization of each number

12: 2 x 2 x3

20: 2 x 2 x 5

24: 2 x 2 x 2 x 3

Multiply the common factors.

2 x 2 = 4

The GCF is 4.

Answer 2

4

Answer 3

4.