Describe how to find the least common multiple of three numbers. Give an example.

LCM (28, 30, and 35)

- Make factor tree for the first number.

- Add any prime factors of 30 that are not in the 28 tree.

- Add any prime factors of 35 that are not in the 30 tree.

- Multiply all together and you will get your LCM.

2 | 28 30 35

5 |14 15 35

2 |14 3 7

7 |7 3 7

1 3 1

LCM = 2*2*3*5*7 =