What greatest common factor should be used to reduce the fraction 12 over 40

4

Step-by-step explanation:

4 x 3 = 12

4 x 10 = 40

4 goes into 12 3 times

4 goes into 40 10 times

your GCF (Greatest Common Factor) = 4

c.

step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.