Question

Find the L.C.M of $5,10$ and $15$ by listing multiples.

Answer 1

Finding L.C.M by using listing method.

Multiples of $5$ are $5,10,15,20,25,30,35,40,45,50$ and so on.

Multiples of $10$ are $10,20,30,40,50,60,70,80,90,100$ and so on.

Multiples of $15$ are $15,30,45,60,75,90,105,120,135,150$ and so on.

Common multiples of $5,10$ and $15$ are $30,60,90$ and so on.

Thus, the smallest/least common multiple or L.C.M of $5,10$ and $15$ is $30$.