Question

list the multiples of each pair and find the LCM of 15,40

Answer 1

15=3×5
40=2×2×2×5

so common pair is 5
finding lcm 5×3×2×2×2
=15×8
=120

Answer 2

15=3*5. LCM 15
15*1. 3
40=2*40
5*8
40*1