Answer :
LCM of 3 and 4 is 12, because 12 is the smallest number that 3 and 4 are both factors for. Type some numbers into the box to the right, and this page will find the LCM of those numbers.
LCM or least common multiple. The first number two or more numbers are a factor of. 10s multiples: 10, 20, 30, 40. 4: 4, 8, 12, 16, 20. The first similar one is 20 therefore 20 is your LCM :)