Question

Find the HCF and LCM of 105,120 and 150 by prime factorisation.

Answer 1

The prime factorisation of 105, 120 and 150 are ;105 = 3×5×7120 = 2×2×2×3×5150 = 2×3×5×5So, LCM = 23 × 3 × 52 × 7 = 4200 HCF = 3 × 5 = 15