Question

Find the LCM of 120 and 210.

Answer 1

840

Explanation:

Multiples of 120:

120, 240, 360, 480, 600, 720, 840, 960, 1080

Multiples of 210:

210, 420, 630, 840, 1050, 1260

Therefore,

LCM(120, 210) = 840

Answer 2

120 = 2³ × 3 × 5

210 = 2 × 3 × 5 × 7

LCM(120 ; 210) = 2³ × 3 × 5 × 7 = 840