50 of them.
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45, 63, 81, 99, 117
There are 50 odd numbers in the range from 1 to 99. This can be calculated by dividing the total range (99 - 1 + 1 = 99) by 2, as every other number in the range is odd. Therefore, 99 / 2 = 49.5, but since we are dealing with whole numbers, there are 50 odd numbers in the range from 1 to 99.
All of the odd numbers between 11 and 99 inclusive are two digit numbers that are not multiples of 2. There are 45 of them.
Well, darling, the sum of the first 99 odd numbers is 9801. You see, you take the last odd number, which is 197, multiply it by the total number of odd numbers (which is 99), and divide by 2. Voila! Math magic at its finest.
There are 49 even numbers between 1 and 99.