what is the greatest common factor of 42, 126, 210

Question

what is the greatest common factor of 42, 126, 210

Answer 1

126 = 2  x  9  x 7 = 2 x 3 x 3 x 7

42 = 6 x 7 = 2 x 3 x 7

210 = 10 x 21 = 2 x 5 x 3 x 7

 

All three of these have in common 2 x 3 x 7 = 42.