Find the highest common factor (HCF/GCF) of 84 and 126.
Note
Prime-factorize: 84 = 2^2×3×7 and 126 = 2×3^2×7; common factors multiply to 2×3×7 = 42, so GCF = 42.
Find the highest common factor (HCF/GCF) of 84 and 126.
Prime-factorize: 84 = 2^2×3×7 and 126 = 2×3^2×7; common factors multiply to 2×3×7 = 42, so GCF = 42.