There are 10 composite numbers from 90 to 100 (including the boundaries):
90, 91, 92, 93, 94, 95, 96, 98, 99 and 100
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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).
Composite numbers are positive integers greater than 1 that have factors other than 1 and themselves. In the range from 90 to 110, the composite numbers are 91, 92, 94, 95, 96, 98, 99, 100, 102, 104, 105, 106, 108, and 110. These numbers can be divided evenly by numbers other than 1 and themselves, making them composite.
The numbers in the 90s are all composite, apart from 97, which is prime.
They are: 90 91 92 93 94 95 and 96 which are between the prime numbers of 89 and 97
The three composite numbers are 28, 30 and 32. Their sum is 90.