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While there are many ways to determine whether a number is prime or composite, there are easy ways to check numbers up to 100:

  • Try factoring the number. A prime numbers has exactly two factors, 1 and the number itself, and a composite number has one or more factors in addition to 1 and the number itself.
  • All numbers greater than 2 and less than 49 are composites if they are even numbers, if they are multiples of 3, or if they end in 5 or 0.
  • Composite numbers 8 to 100 include the above and all numbers divisible by 7.

Test larger numbers by trial division by larger primes that are less than the square root of the number.

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Q: What are the steps to determining whether a number is prime or composite?
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Can a number not be prime or composite?

Now.... That depends on whether it is a number orr not!? :)


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20 is a composite number


How do you figure out a composite number?

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Can you tell a prime or composite number by seeing if its odd or even?

You cannot. If a number is even - other than 2 - then it is a composite number. However, if it is odd, it is not easily possible to tell whether it is prime or composite.


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What is the gcf if one number is prime and the other is composite?

The answer depends on whether or not the prime number is a factor of the other number.If the prime number is a factor of the other number then the GCF is the prime, otherwise the GCF is 1.


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What is the fastest way to tell whether a number is prime or composite?

Ask us.


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