, ,

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.

has factors of and .

has factors of and .

has factors of and .

has factors of and .

Multiply by .

Multiply by .

Find the LCM 4 , 10 , 20