What is the Least Common Multiple of 140 and 156?

Least common multiple or lowest common denominator (lcd) can be calculated in two way; with the LCM formula calculation of greatest common factor (GCF), or multiplying the prime factors with the highest exponent factor.

Least Common Multiple of 140 and 156 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 140 and 156, than apply into the LCM equation.

GCF(140,156) = 4
LCM(140,156) = ( 140 × 156) / 4
LCM(140,156) = 21840 / 4
LCM(140,156) = 5460

Least Common Multiple (LCM) of 140 and 156 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 140 and 156. First we will calculate the prime factors of 140 and 156.

Prime Factorization of 140

Prime Factorization of 156

Now multiplying the highest exponent prime factors to calculate the LCM of 140 and 156.

LCM(140,156) = 2² × 5¹ × 7¹ × 3¹ × 13¹
LCM(140,156) = 5460