What is the Least Common Multiple of 81380 and 81388?

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 of 81380 and 81388 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 81380 and 81388, than apply into the LCM equation.

GCF(81380,81388) = 4
LCM(81380,81388) = ( 81380 × 81388) / 4
LCM(81380,81388) = 6623355440 / 4
LCM(81380,81388) = 1655838860

Least Common Multiple (LCM) of 81380 and 81388 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 81380 and 81388. First we will calculate the prime factors of 81380 and 81388.

Prime Factorization of 81380

Prime Factorization of 81388

Now multiplying the highest exponent prime factors to calculate the LCM of 81380 and 81388.

LCM(81380,81388) = 2² × 5¹ × 13¹ × 313¹ × 20347¹
LCM(81380,81388) = 1655838860