Question

James thinks of two numbers. He says “The Highest Common Factor (HCF) of my two numbers is 3 The Lowest Common Multiple (LCM) of my two numbers is 45” Write down two numbers that James could be thinking of.

Answer 1

9 , 15

Explanation:

HCF = 3

LCM = 45

Product of two numbers = HCF * LCM

= 3*45

= 135

The two numbers are the factors of 135

9 * 15 = 135

9 = 3*3

15 = 3 * 5

HCF = 3

LCM = 3* 3 * 5 = 45