How can you find the greastest common factor of 70?

Answer 1

You can't. You need at least two numbers to find a GCF.

Answer 2

Factor them.

2 x 2 x 2 x 5 = 40

2 x 5 x 7 = 70

Select the common factors.

2 x 5 = 10, the GCF

Answer 3

3 x 7 = 21

2 x 5 x 7 = 70

The GCF is 7.

Answer 4

2 x 2 x 2 x 5 = 40

2 x 5 x 7 = 70

Answer 5

The GCF is 8.