Find the highest common factor (HCF) or greatest common divisor (GCD) of 84 and 126.
Note
Prime factors: 84 = 2^2 × 3 × 7 and 126 = 2 × 3^2 × 7; common factors multiply to 2 × 3 × 7 = 42, the GCD.
Find the highest common factor (HCF) or greatest common divisor (GCD) of 84 and 126.
Prime factors: 84 = 2^2 × 3 × 7 and 126 = 2 × 3^2 × 7; common factors multiply to 2 × 3 × 7 = 42, the GCD.