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).
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All of them except for 83, 89 and 97 which are prime numbers
The composite numbers between 70 and 80 are 72, 74, 75, 76, 77 and 78.
All even numbers between 50 and 80 are composite.
Out of those 100 numbers, 21 of them are prime numbers, so the remaining (100 - 21) = 79 are composite.
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