Find the highest common factor (HCF) of 84 and 126.
Note
Prime factorizations: 84 = 2^2·3·7 and 126 = 2·3^2·7; common factors 2·3·7 = 42, so HCF = 42.
Find the highest common factor (HCF) of 84 and 126.
Prime factorizations: 84 = 2^2·3·7 and 126 = 2·3^2·7; common factors 2·3·7 = 42, so HCF = 42.