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When the numbers are relatively prime.

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Q: Under what conditions is the LCM of two composite numbers simply the product of the two numbers?

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When the numbers are relatively prime.

The statement is simply not true! For example, 6 is composite.

The product of 6.5 and 65.2 is 423.8. If you want to get the product of two numbers, you simply multiply the numbers provided and the result will be their product.

Nobody invented them. They are simply numbers, prime or composite, such that they have no factor in common other than 1.

Yes. All non-prime numbers are composite numbers, which simply means a number has one or more prime factors other than 1 and the number itself.

If you simply add numbers the answer is the sum of those numbers.

First, zero is not applied to the terms prime and composite because the definitions only apply to natural numbers (positive whole numbers, which does not include zero). One is not prime or composite because one is the unit that is used within the definition of prime of composite numbers, and many definitions of prime and composite even exclude one from the definition. If you want to categorize one within a discussion of prime and composite, it is common to simply call one the unit.

All numbers that only have one and itself as factors are prime. Therefore, to tell if a number is prime simply find it's factors. If it has more than two factors than it is not a prime number, otherwise it is composite.

The easiest thing to do would be to simply plug it into a calculator. A "product" is simply the answer you get after multiplying numbers together. You could also do the math by hand by multiplying the two numbers together.

The LCM of 23 and 29 is 665. Both numbers are prime, so the LCM is simply the product of both numbers, 667

Nobody invented them. They are simply numbers, prime or composite, such that they have no factor in common other than 1.

Product is simply the result when you multiply two numbers, so the product of 2 and 12 is 2*12 = 24.