Factor them.
2 x 5 = 10
3 x 7 = 21
No factors in common. Multiply them.
2 x 3 x 5 x 7 = 210
Ah, the Least Common Multiple, isn't that a happy little thing to find? To get the LCM of 10 and 21, we look for the smallest number that both 10 and 21 can divide into evenly. In this case, the LCM of 10 and 21 is 210. Just like painting, finding the LCM is all about bringing things together in harmony.
The LCM of 10 and 21 is: 210Least Common Multiple (LCM) for 10 21 is 210
The LCM is 252.
Th LCM of 21 and 42 is: 42
The LCM is 189.
The LCM is 21.
It is: 21
210
The LCM is 189.
2 and 5 are both prime numbers. If you multiply them together, the answer is 10. 10 is the LCM of 2 and 5.
The LCM of 21 and 24 is 168. Because you multiply 21 with 1,2,3,4 etc. and do the same with 24. Then when you find the number that is the same, that is your LCM.
It is: 840