What is the Least Common Multiple of 678 and 685?
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 678 and 685 is 464430.
LCM(678,685) = 464430
Least Common Multiple of 678 and 685 with GCF Formula
The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 678 and 685, than apply into the LCM equation.
GCF(678,685) = 1
LCM(678,685) = ( 678 × 685) / 1
LCM(678,685) = 464430 / 1
LCM(678,685) = 464430
Least Common Multiple (LCM) of 678 and 685 with Primes
Least common multiple can be found by multiplying the highest exponent prime factors of 678 and 685. First we will calculate the prime factors of 678 and 685.
Prime Factorization of 678
Prime factors of 678 are 2, 3, 113. Prime factorization of 678 in exponential form is:
678 = 21 × 31 × 1131
Prime Factorization of 685
Prime factors of 685 are 5, 137. Prime factorization of 685 in exponential form is:
685 = 51 × 1371
Now multiplying the highest exponent prime factors to calculate the LCM of 678 and 685.
LCM(678,685) = 21 × 31 × 1131 × 51 × 1371
LCM(678,685) = 464430
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