Question

Fine hcf and lcm by applying PRIME factorisation method!

12,15 and 21

Answer 1

$\huge\underline\mathfrak\red{Solution}$

12 = 2×2×3

15 = 3×5

21=3×7

HCF = 3

LCM = 2×2×3×5×7

LCM = 420

Answer 2

So the numbers are.

12,15 and 21

12 = 4 × 3

15 = 5 × 3

21 = 7 × 3

HCF = 3

LCM = 4 × 3 × 5 × 7 = 420