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Q: Using the numbers 1-30 which ones are prime and composite?

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The ones that aren't prime. The ones with more than two factors.

Prime numbers r ones that can only be multiplied by itself and 1 to get it and composite is everything else

Yes except for 2 on its own which is the only even prime number

Basically, composite numbers are the non-prime numbers. Take a table of prime numbers, and look for any two prime numbers, one after the other, that have a difference greater than 2. Any numbers in between are consecutive composite numbers. For example, the next prime number after 13 is 17; that makes 14, 15, and 16 three consecutive non-primes, i.e., composite numbers.

The prime numbers are 3 and 7 but 1 is not considered to be a prime or a composite number

Only one positive prime number has a 5 in the ones digit. That prime number is 5. All other numbers with a 5 in the ones digit are composite because they will be divisible by 5.

There may not be any fast methods. In fact, composite numbers which are the product of two very large primes are used for public key encryption. This depends on the fact that there is no fast answer to factorising composite numbers.

It is true (as long as there are no decimal places after the ones place) because those numbers will always be divisible by 2, 5, and 10. With exception of the number zero which is neither prime nor composite.

The ones that aren't prime. Asking a multiple choice question without providing the choices doesn't really seem fair.

A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite. A number cannot be both.

Yes except for 2 on its own which is the only even prime number

Yes except for 2 on its own which is the only even prime number.

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