Question

Find the HCF and LCM of 26, 65 and 117, using prime factorisation.

Answer 1

26 = 2 × 13

65 = 5 × 13

117 = 3 × 3 × 13

∴ HCF of 26, 65 and 117 = 13

and LCM of 26, 65 and 117 = 13 × 3 × 3 × 2 × 5 = 1170