81, 82, 84, 85, 86, 87, 88. 80 and 90 are composite too
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The composite numbers are: 72, 74, 75, 76, 77, 78, 80, 81, 82, 84, 85, 86 ,87, 88
The numbers 80, 81, 82, 84, 85, 86, 87, 88, 90, 91, 92, 93, 94, 95, 96, 98, 99 and 100 are composite (including the boundaries).
Well, honey, a composite number is any ol' number greater than 1 that ain't prime, so let's see here... Ah, 85 fits the bill! It can be divided by 1, 5, 17, and itself. So, there you have it, a sassy little composite number between 80 and 100.
Composite numbers have factors other than 1 and itself. So, two good examples are: 62 and 84
The numbers in the 90s are all composite, apart from 97, which is prime.