Question

Whats the lcm of 30, 45, 10

Answer 1

There least common factor would be 5 since they are all divisible by 5.

Answer 2

The least common factor of 30, 45, and 10 is 5. 

30=2*3*5
45=3*3*5
10=2*5

By looking at the 3 prime factorizations, you can see that 5 is the biggest prime number that is present in all 3 prime factorizations.