All 2-digit primes are odd so their difference MUST be even.
I make it 97 - 11 = 86
Very interesting, but you appear to have put the word "prime" into a question that did not contain it.
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9999
The smallest number is 5,789. The largest is 98,750. The difference is 92,961.
9888
The smallest is 11 and the largest is 97.
The smallest two digit number is 00 (a number used as a wire gauge) and the largest is 99, so the difference between the largest and smallest 2-digits numbers is 99 (99 - 00)