55 , 15

The LCM is the smallest positive number that all of the numbers divide into evenly.

1. List the prime factors of each number.

2. Multiply each factor the greatest number of times it occurs in either number.

55 has factors of 5 and 11.

5⋅11

15 has factors of 3 and 5.

3⋅5

The LCM of 55,15 is the result of multiplying all prime factors the greatest number of times they occur in either number.

3⋅5⋅11

Multiply 3 by 5.

15⋅11

Multiply 15 by 11.

165

165

Find the LCM 55 , 15