There are 90 two-digit whole numbers between 1 and 100.
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50 - 25 = 25
A 'digit' is a numeral - and we have ten of them — 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9. After that we re-use them - 10 is not a digit, it is two digits put together.
The answer is 99. When 99 is the greatest two-digit number that rounds to 100 when rounded to the nearest Ten.
90 10-20=10 20-30=10 30-40=10 40-50=10 50-60=10 60-70=10 70-80=10 80-90=10 90-99=9 Thus, the answer is actually 89 two-digit numbers between 1 and 100. You do not count 100 itself because it is NOT a two-digit number, it is a three-digit number. On top of that, you begin your counting at 10, since 10 is the FIRST two-digit number in the sequence. Then the answer should be sligtly more clear.
95