What is the Least Common Multiple of 605 and 620?
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 605 and 620 is 75020.
LCM(605,620) = 75020
Least Common Multiple of 605 and 620 with GCF Formula
The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 605 and 620, than apply into the LCM equation.
GCF(605,620) = 5
LCM(605,620) = ( 605 × 620) / 5
LCM(605,620) = 375100 / 5
LCM(605,620) = 75020
Least Common Multiple (LCM) of 605 and 620 with Primes
Least common multiple can be found by multiplying the highest exponent prime factors of 605 and 620. First we will calculate the prime factors of 605 and 620.
Prime Factorization of 605
Prime factors of 605 are 5, 11. Prime factorization of 605 in exponential form is:
605 = 51 × 112
Prime Factorization of 620
Prime factors of 620 are 2, 5, 31. Prime factorization of 620 in exponential form is:
620 = 22 × 51 × 311
Now multiplying the highest exponent prime factors to calculate the LCM of 605 and 620.
LCM(605,620) = 51 × 112 × 22 × 311
LCM(605,620) = 75020
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