91, 92, 93, 94, 95, 96, 98, 99, 100
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The numbers 90, 91, 92, 93, 94, 95, 96, 98, 99 and 100 are composite (including the boundaries).
There are 8 composite numbers between 90 and 100. They are 91, 92, 93, 94, 95, 96, 98, and 99.
Add them up. 90, 91, 92, 93, 94, 95, 96, 98, 99, 100
91 is the only composite factor of 91. 7 and 13 are prime.
The numbers between 89 and 97 are: 90, 91, 92, 93, 94, 95, 96. All even numbers greater than 2 are composite. All numbers greater than 5 are divisible by 5 are composite. 93 is divisible by 3, so that only leaves 91 as a prime number. The composite numbers are 90, 92, 93, 94, 95, 96.