LCM(100, 80) = 400
LCM is equal to the product of the common prime factors on the left and the left-overs on the bottom.
LCM(100, 80) = 2 . 2 . 5 . 5 . 4 = 400
Common multiples of 100 and 80 are 400, 800, 1200 ...
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.