Find the highest common factor (HCF) of 84 and 126.
Note
The HCF is 42 because 84 = 2^2 × 3 × 7 and 126 = 2 × 3^2 × 7; the common prime factors with lowest powers are 2 × 3 × 7 = 42.
Find the highest common factor (HCF) of 84 and 126.
The HCF is 42 because 84 = 2^2 × 3 × 7 and 126 = 2 × 3^2 × 7; the common prime factors with lowest powers are 2 × 3 × 7 = 42.