Only one positive Prime number has a 5 in the ones digit. That prime number is 5. All other numbers with a 5 in the ones digit are composite because they will be divisible by 5.
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17, 37, 47, 67, 97
Ten.
There are 21 two-digit prime numbers. The first two-digit prime number is 11, and the last two-digit prime number is 97. Prime numbers are numbers greater than 1 that are only divisible by 1 and themselves.
149 of them.
13, 23, 43, 53, 73 & 83