Question

Find the greatest common factor of 210, 84, and 56

Answer 1

write the prime factors:-

56 = 2*2*2*7
84 = 2*2*3*7
210 = 2*3*5*7

Pick out the numbers common to all three factors;
They are 2 and 7.

So the GCF = 2*7 = 14 answer

Answer 2

To get the Greates Common Factor (GCF) of 84 and 210 we need to factor each value first and then we choose all the copies of factors and multiply them:

84: 223 7210: 2 357GCF: 2 3 7The Greates Common Factor (GCF) is: 2 x 3 x 7 = 42