What is the Least Common Multiple of 1285 and 1305?

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 1285 and 1305 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 1285 and 1305, than apply into the LCM equation.

GCF(1285,1305) = 5
LCM(1285,1305) = ( 1285 × 1305) / 5
LCM(1285,1305) = 1676925 / 5
LCM(1285,1305) = 335385

Least Common Multiple (LCM) of 1285 and 1305 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 1285 and 1305. First we will calculate the prime factors of 1285 and 1305.

Prime Factorization of 1285

Prime Factorization of 1305

Now multiplying the highest exponent prime factors to calculate the LCM of 1285 and 1305.

LCM(1285,1305) = 5¹ × 257¹ × 3² × 29¹
LCM(1285,1305) = 335385