Find the highest common factor (HCF) of 84 and 126.
Note
Using prime factors: 84 = 2^2×3×7, 126 = 2×3^2×7; common factors: 2^1×3^1×7 = 42, so HCF = 42.
Find the highest common factor (HCF) of 84 and 126.
Using prime factors: 84 = 2^2×3×7, 126 = 2×3^2×7; common factors: 2^1×3^1×7 = 42, so HCF = 42.