Question

What is the least common multiple of 18, 20, and 9?

Answer 1

180

Explanation:

2| 18, 20, 9

2 | 9, 10, 9

3 | 9, 5, 9

3| 3, 5, 3

5 | 1, 5, 1

| 1, 1, 1

LCM OF 18, 20, 9 = 2*2*3*3*5 = 180

Answer 2

ANSWER: 180

Multiples of 9:
9, 18, 27, 36, 45, 54, 63, 72, 81, 90, 99, 108, 117, 126, 135, 144, 153, 162, 171, 180

Multiples of 18:
18, 36, 54, 72, 90, 108, 126, 144, 162, 180

Multiples of 20:
20, 40, 60, 80, 100, 120, 140, 160, 180