the lowest is 10, the highest is 99...
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There are 21 two-digit prime numbers.
There is no THE two-digit natural number because there are many of them. 10, 11, 12, .. 99 are all 2-digit natural numbers.
7 two-digit numbers.
There are 90 two-digit numbers... starting with 10 and ending with 99.
All the numbers from 10 to 99 are positive 2 digit integers