90.
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80 and 100
97 is the largest prime number below 100.
80 and 100
A prime number has no other factors except itself and 1. There are three numbers between 80 and 100 that are prime: 83, 89 and 97.
90. The Least Common Multiple of 2, 3 and 5 is 30 and the multiple of 30 that is between 80 and 100 is 90.