All of them except 97 which is a Prime number because it has only two factors which are itself and one.
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There are 8 composite numbers between 90 and 100. They are 91, 92, 93, 94, 95, 96, 98, and 99.
90 to 96
The numbers 90, 91, 92, 93, 94, 95, 96, 98, 99 and 100 are composite (including the boundaries).
Add them up. 90, 91, 92, 93, 94, 95, 96, 98, 99, 100
70 and 90