Question

Write each number as the product of its prime factors and determine the LCM and HCF of each set of numbers

1. 225 and 315
2. 120;180 and 450​

Answer 1

1. 225 = 3x3x5x5

315 = 3x3x5x7

LCM = 3x3x5x5x7 = 1575

HCF = 3x3x5 = 45

2. 120 = 2x2x2x3x5

180 = 2x2x3x3x5

450 = 2x3x3x5x5

LCM = 2x2x2x3x3x5x5= 1800

HCF = 2x3x5 = 30