Find the greatest common divisor (GCD/HCF) of 84 and 126.
Note
Using prime factors: 84 = 2^2 × 3 × 7 and 126 = 2 × 3^2 × 7; common factors are 2^1 × 3^1 × 7 = 42, so GCD is 42.
Find the greatest common divisor (GCD/HCF) of 84 and 126.
Using prime factors: 84 = 2^2 × 3 × 7 and 126 = 2 × 3^2 × 7; common factors are 2^1 × 3^1 × 7 = 42, so GCD is 42.