Question

Find the LCM of 308 and 420.

Answer 1

308 = 2² × 7 × 11

420 = 2² × 3 × 5 × 7

LCM(308 ; 420) = 2² × 3 × 5 × 7 × 11 = 4620

Answer 2

4620

Explanation:

Multiples of 308:

308, 616, 924, 1232, 1540, 1848, 2156, 2464, 2772, 3080, 3388, 3696, 4004, 4312, 4620, 4928, 5236

Multiples of 420:

420, 840, 1260, 1680, 2100, 2520, 2940, 3360, 3780, 4200, 4620, 5040, 5460

Therefore,

LCM(308, 420) = 4620