What is the Least Common Multiple of 7990 and 8005?

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 7990 and 8005 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 7990 and 8005, than apply into the LCM equation.

GCF(7990,8005) = 5
LCM(7990,8005) = ( 7990 × 8005) / 5
LCM(7990,8005) = 63959950 / 5
LCM(7990,8005) = 12791990

Least Common Multiple (LCM) of 7990 and 8005 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 7990 and 8005. First we will calculate the prime factors of 7990 and 8005.

Prime Factorization of 7990

Prime Factorization of 8005

Now multiplying the highest exponent prime factors to calculate the LCM of 7990 and 8005.

LCM(7990,8005) = 2¹ × 5¹ × 17¹ × 47¹ × 1601¹
LCM(7990,8005) = 12791990