LCM(18, 15) = 90
LCM is equal to the product of the common prime factors on the left and the left-overs on the bottom.
LCM(18, 15) = 3 . 6 . 5 = 90
Common multiples of 18 and 15 are 90, 180, 270 ...
The least common multiple (LCM) of two positive whole numbers is the smallest number that is divisible by these numbers. LCM can be found by using the upside-down cake method. It is equal to the product of the common prime factors listed on the left and the leftovers on the right.