Question

What is the least common multiple of 3,9, 15?

Answer 1

$LCM\ is\ the\ least\ common\ number\ that\ is\ multiply\ of\ 3,9,15:\\\\ Factors\ of\ 3\\ 3:3\\ 1:1\\\\ Factors\ of\ 9:\\ 9:3\\ 3:3\\1:1\\\\ Factors\ of\ 15\\ 15:3\\ 5:5\\ 1:1\\\\ LCM(3,9,15)=3^2*5=9*5=45\\\\ \textbf{LCM (3,9,15)=45}$

Answer 2

15: 15,30,45
9:9,18,27,45
3: 3,6,9,12,15,18,21,24,27,30,33,36,39,42,45
common multiples: 45
LCM: 45