99.Because if you do 0 minus 99 whats the answer?99.So it has 99 numbers in a 2-digit number.
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to do it the long way do it by long division to do it the short way put it in the calculator 2 digits numbers are just the numbers between10-99 and one digits numbers are just the numbers between 0-9.
There is no smallest whole number - negative numbers go on forever. Therefore, there are infinitely many whole numbers that are smaller than the greatest 2-digit number.
100 (0-99)
2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97
The 3-digit numbers are all the counting numbers from 100 to 999.That's (the first 999 counting numbers) minus (the first 99 of them).There are 900 of them.