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What is the Least Common Multiple of 855 and 861?

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 (LCM) of 855 and 861 is 245385.

LCM(855,861) = 245385

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Least Common Multiple of 855 and 861 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 855 and 861, than apply into the LCM equation.

GCF(855,861) = 3
LCM(855,861) = ( 855 × 861) / 3
LCM(855,861) = 736155 / 3
LCM(855,861) = 245385

Least Common Multiple (LCM) of 855 and 861 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 855 and 861. First we will calculate the prime factors of 855 and 861.

Prime Factorization of 855

Prime factors of 855 are 3, 5, 19. Prime factorization of 855 in exponential form is:

855 = 32 × 51 × 191

Prime Factorization of 861

Prime factors of 861 are 3, 7, 41. Prime factorization of 861 in exponential form is:

861 = 31 × 71 × 411

Now multiplying the highest exponent prime factors to calculate the LCM of 855 and 861.

LCM(855,861) = 32 × 51 × 191 × 71 × 411
LCM(855,861) = 245385