How many positive 3 digit numbers are odd?
Well, half of all the 3 digit numbers would be odd, right? Since numbers alternate between odd and even. So how many positive 3-digit numbers are there? Well, that’s just all the numbers between 100 and 999, which is 900 numbers. Therefore, 450 are odd (and 450 are even). I hope this explanation helps you see how you can reason these out for yourself.
