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Q: Can LCM be found by composite numbers?

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You need at least two numbers to find an LCM. It doesn't matter whether they are prime or composite.

When the numbers are relatively prime.

6,364 and 9

6 and 8

LCM of 7 and 13Since 7 and 13 are both prime numbers, or numbers whose only factors are 1 and itself, the LCM can be found by multiplying 7 and 13 together. The answer will be 91.Though multiplying the numbers together when working with composite numbers MIGHT work, it only works 100% of the time when both numbers are prime. If one or both numbers are composite (have more factors than 1 and itself), multiples should be listed until a common one is found. That number will be the LCM.The LCM of 7 and 13 is 91.

When the numbers are relatively prime.

They are 4 and 9

well, look at the factors of 16...we have 2,4,8, and16.So if we had LCM of 8 and 16, that would be 16 an both are composite

Any prime number with its multiple.

Firstly, the LCM f a single number is the number itself.The LCM of many numbers is found by dividing the numbers with the smallest prime numbers until the numbers are completely divided and the remainder is zero.Then all the prime numbers used for dividing is multiplied and the LCM is found.

12 and 18

240, 480 and 7200

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