Question

use factor trees to find the GCF of 15, 25 show your work

Answer 1

The Greatest Common Factor of

15

and

25

is

5

.

The factors of

15

are

3

and

5

(the number itself and 1 do not count).

The factor(s) of

25

is

5

. After all, it is a square number.

The only factor that is in common is

5

(again remember that 1 does not count here -although

1

is common,

5

is higher)

Hope I helped!

Explanation: