Question

what is the greatest common factor of 70 and 45

Answer 1

Factors of 70 = 1 , 2 , 5 , 7 , 10 , 14 , 35 , 70.

Factors of 45 = 1 , 3 , 5 , 9 , 10 ,15 , 45.

Common factors of 70 and 45 = 1 , 5 .

So 

The greatest common factor 70 and 45 is 5.

Answer 2

Factors of 70 are1,2,5,7,10,14,35,70
Factors of 45 are1,3,5,9,10,15,45
Common factors of 70 and 45 are 1,5
Thus the greatest common factor of 70 and 45 is 5