What is the Least Common Multiple of 11978 and 11990?

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 11978 and 11990 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 11978 and 11990, than apply into the LCM equation.

GCF(11978,11990) = 2
LCM(11978,11990) = ( 11978 × 11990) / 2
LCM(11978,11990) = 143616220 / 2
LCM(11978,11990) = 71808110

Least Common Multiple (LCM) of 11978 and 11990 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 11978 and 11990. First we will calculate the prime factors of 11978 and 11990.

Prime Factorization of 11978

Prime Factorization of 11990

Now multiplying the highest exponent prime factors to calculate the LCM of 11978 and 11990.

LCM(11978,11990) = 2¹ × 53¹ × 113¹ × 5¹ × 11¹ × 109¹
LCM(11978,11990) = 71808110