What is the Least Common Multiple of 15981 and 15990?

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 15981 and 15990 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 15981 and 15990, than apply into the LCM equation.

GCF(15981,15990) = 3
LCM(15981,15990) = ( 15981 × 15990) / 3
LCM(15981,15990) = 255536190 / 3
LCM(15981,15990) = 85178730

Least Common Multiple (LCM) of 15981 and 15990 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 15981 and 15990. First we will calculate the prime factors of 15981 and 15990.

Prime Factorization of 15981

Prime Factorization of 15990

Now multiplying the highest exponent prime factors to calculate the LCM of 15981 and 15990.

LCM(15981,15990) = 3¹ × 7¹ × 761¹ × 2¹ × 5¹ × 13¹ × 41¹
LCM(15981,15990) = 85178730