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99
There are 50 odd numbers between 0 and 100.Five of them (1, 3, 5, 7, and 9) are outside the range you're considering.That leaves 45 of them, including 11 and 99.
45, 63, 81, 99 4 of them.
The sum of all odd numbers 1 through 99 is 9,801.
99 is an odd number. In mathematics, odd numbers are integers that are not divisible by 2. Since 99 cannot be divided evenly by 2 (99 ÷ 2 = 49.5), it is classified as an odd number.