Find the GCF for each set of numbers.

Question

28,42,56

3,5

4,5,6

Answer 1

28,42,56
Factors of 56: 2, 4, 7, 8

Which of those also are factors of 28 and 42?

Answer 2

1) The factors of 28 are: 1, 2, 4, 7, 14, 28

The factors of 42 are: 1, 2, 3, 6, 7, 14, 21, 42

The factors of 56 are: 1, 2, 4, 7, 8, 14, 28, 56

Then the greatest common factor is 14.

2) The factors of 3 are: 1, 3

The factors of 5 are: 1, 5

Then the greatest common factor is 1.

3)The factors of 4 are: 1, 2, 4

The factors of 5 are: 1, 5

The factors of 6 are: 1, 2, 3, 6

Then the greatest common factor is 1.

Answer 3

Thank you,both of you!

Answer 4

3)The factors of 4 are: 1, 2, 4
The factors of 5 are: 1, 5
The factors of 6 are: 1, 2, 3, 6
Then the greatest common factor is ?.