What is the Least Common Multiple of 861 and 875?
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 861 and 875 is 107625.
LCM(861,875) = 107625
Least Common Multiple of 861 and 875 with GCF Formula
The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 861 and 875, than apply into the LCM equation.
GCF(861,875) = 7
LCM(861,875) = ( 861 × 875) / 7
LCM(861,875) = 753375 / 7
LCM(861,875) = 107625
Least Common Multiple (LCM) of 861 and 875 with Primes
Least common multiple can be found by multiplying the highest exponent prime factors of 861 and 875. First we will calculate the prime factors of 861 and 875.
Prime Factorization of 861
Prime factors of 861 are 3, 7, 41. Prime factorization of 861 in exponential form is:
861 = 31 × 71 × 411
Prime Factorization of 875
Prime factors of 875 are 5, 7. Prime factorization of 875 in exponential form is:
875 = 53 × 71
Now multiplying the highest exponent prime factors to calculate the LCM of 861 and 875.
LCM(861,875) = 31 × 71 × 411 × 53
LCM(861,875) = 107625
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