Question

The LCM of 24, 36, 40 is
(a) 4
(b) 90
(c) 360
(d) 720

Answer 1

(c) 360

$\begin{array}{l}2\overline{)24,36,40}\\ 2\overline{)12,18,20}\\ 2\overline{)\text{6, 9, 10}}\\ 3\overline{)\text{3, 9, 5}}\\ 3\overline{)\text{1, 3, 5}}\\ 5\overline{)\text{1, 1, 5}}\\ \text{1, 1, 1}\end{array}$

L.C.M. = 2³ × 3² × 5
= 360