The answer is 60. The best way to do this is put the numbers in a row and a line beneath them. On the left hand side start with the smallest Prime number that goes into them which is 2. The numbers that are divided by 2 go under the line and the numbers not divided by to do the same. Once you cannot use the 2 go up to the next prime number three. Do these steps until you have number ones left on the bottom. Then multiply the numbers on the left hand side to get your LCM.