To determine if 80 is a prime number or a composite number, we simply look at the factors for 80.
If the factors of 80 are only 80 and 1, then we know that 80 is a prime number. Otherwise, 80 is a composite number.
To explain better, if 80 is only divisible by 1 and 80, then it is a prime number, and if 80 is divisible by more than 80 and 1, then it is a composite number.
The factors of 80 are as follows:
1, 2, 4, 5, 8, 10, 16, 20, 40, 80
Therefore, since 80 is divisible by more than one and itself, the answer to the
question "Is 80 prime or composite?" is highlighted in blue below.
composite
Is 81 prime or composite?
OK. Now you know that 80 is a composite number. Use our logic above and see if
you can figure out if the next number on our list is prime or composite before you check your answer.
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