LCM of 36 and 45 The LCM of 36 and 45 is 180. To find the LCM, list the multiples of each number. The first one that both numbers have in common is the LCM. 36: 36, 72, 108, 144, 180, 216 45: 45, 90, 135, 180, 225 The first multiple they have in common is 180, so it is the LCM. this is wrong.......