Question

Find the GCD:

(3) 6, 12, 18

Answer 1

The divisors of 6 are 1, 2, 3 and 6.
The divisors of 12 are 1, 2, 3, 4, 6 and 12.
The divisors of 18 are 1, 2, 3, 6, 9 and 18.
The common divisors are 1, 2, 3 and 6.
Thus, the GCD or HCF is 6.