33, 35, 39, 45, 49
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.
There are ninety 2-digit numbers all together. 45 of them are odd numbers. The other 45 of them are even numbers.
Count how many of the numbers are odd. If an odd number of them are odd, then their sum is odd. If an even number of them are odd, then their sum is even.
31, 33, 35, 37, 39, 41, 43 & 45 = eight odd numbers !
45
There are 45 such numbers.
45 has only one number and that is 45. It is odd so 45 has one odd number.
45
odd numbers between 25 and 45 inclusive are 25 27 29 31 33 35 37 39 41 43 45
45
45 of them.
45, 63, 81, 99, 117
six 37 39 41 43 45 47
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.
33, 35, 39, 45, 49