When two numbers are relatively prime, the LCM will be their product.
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When the two numbers are relatively prime.
If the second number is a multiple of the prime number, than the LCM is the second number. If the second number is not a multiple of the prime number, then the two numbers are relatively prime, and the LCM is the product of the two numbers.
40 is the LCM of 5 and 8. If two numbers are relatively prime ( have no divisors in common, the LCM is just their product. )
Most of the time. If you can recognize that the two numbers are relatively prime, factorization isn't necessary. Just multiply the two numbers together.
When all of them are prime numbers,then just multiply the numbers to get the LCM of those 3 numbers.