What is the Least Common Multiple of 408 and 421?
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 408 and 421 is 171768.
LCM(408,421) = 171768
Least Common Multiple of 408 and 421 with GCF Formula
The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 408 and 421, than apply into the LCM equation.
GCF(408,421) = 1
LCM(408,421) = ( 408 × 421) / 1
LCM(408,421) = 171768 / 1
LCM(408,421) = 171768
Least Common Multiple (LCM) of 408 and 421 with Primes
Least common multiple can be found by multiplying the highest exponent prime factors of 408 and 421. First we will calculate the prime factors of 408 and 421.
Prime Factorization of 408
Prime factors of 408 are 2, 3, 17. Prime factorization of 408 in exponential form is:
408 = 23 × 31 × 171
Prime Factorization of 421
Prime factors of 421 are 421. Prime factorization of 421 in exponential form is:
421 = 4211
Now multiplying the highest exponent prime factors to calculate the LCM of 408 and 421.
LCM(408,421) = 23 × 31 × 171 × 4211
LCM(408,421) = 171768
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