What is the Least Common Multiple of 398 and 415?

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 398 and 415 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 398 and 415, than apply into the LCM equation.

GCF(398,415) = 1
LCM(398,415) = ( 398 × 415) / 1
LCM(398,415) = 165170 / 1
LCM(398,415) = 165170

Least Common Multiple (LCM) of 398 and 415 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 398 and 415. First we will calculate the prime factors of 398 and 415.

Prime Factorization of 398

Prime Factorization of 415

Now multiplying the highest exponent prime factors to calculate the LCM of 398 and 415.

LCM(398,415) = 2¹ × 199¹ × 5¹ × 83¹
LCM(398,415) = 165170