What is the greatest common factor of 12 and 16 and 20?

Answer 1

The highest common factor of 12,16, and 20 is 4
You need to factor each number.

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

16: 1, 2, 4, 8, 16

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

Then just find the highest number that is in all three sets.

Eliminate the highest number you see if it isn't in all three sets.

20, 16, 12, 10, 8, 6, 5

On the next number, 4, notice all three sets have a 4. That's the answer.

Answer 2

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

Factors of 16: 1, 2, 4, 8, 16

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

GCF (12, 16, 20) = 4

Answer 3

The GCF is 4.

Answer 4

The GCF is 4.

Answer 5

GCF(12, 20, 16) = 4.

Answer 6

4

Answer 7

5