What is LCM of 84 and 126?

Answer 1

break the numbers down to their prime factors.

84 = 2 x 2 x 3 x 7

126 = 2 x 3 x 3 x 7

they have 2,3, and 7 in common

and 2 and 3 are the remainder

so the lowest common multiple is 2x3x7x2x3 = 252

or 84 x 3 = 252

and 126 x 2 = 252