Question 3

Find the LCM and HCF of the following integers by applying the prime factorisation method.

(iii) 8, 9 and 25

Step 1: Prime factorisation

8 = 2³
9 = 3²
25 = 5²

Step 2: HCF

There is no common prime factor.
HCF = 1

Step 3: LCM

LCM = 2³ × 3² × 5²
LCM = 1800