The LCM of 24 and 40 is 120. To find the LCM (least common multiple) of 24 and 40, we need to find the multiples of 24 and 40 (multiples of 24 = 24, 48, 72, 96 . . . . 120; multiples of 40 = 40, 80, 120, 160) and choose the smallest multiple that is exactly divisible by 24 and 40, i.e., 120.