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What is the Least Common Multiple of 261 and 278?

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 261 and 278 is 72558.

LCM(261,278) = 72558

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Least Common Multiple of 261 and 278 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 261 and 278, than apply into the LCM equation.

GCF(261,278) = 1
LCM(261,278) = ( 261 × 278) / 1
LCM(261,278) = 72558 / 1
LCM(261,278) = 72558

Least Common Multiple (LCM) of 261 and 278 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 261 and 278. First we will calculate the prime factors of 261 and 278.

Prime Factorization of 261

Prime factors of 261 are 3, 29. Prime factorization of 261 in exponential form is:

261 = 32 × 291

Prime Factorization of 278

Prime factors of 278 are 2, 139. Prime factorization of 278 in exponential form is:

278 = 21 × 1391

Now multiplying the highest exponent prime factors to calculate the LCM of 261 and 278.

LCM(261,278) = 32 × 291 × 21 × 1391
LCM(261,278) = 72558