How many odd numbers between 2 and 54?




How many odd numbers between 2 and 54? You could just make a list of all the odd numbers between 2 and 54 and then count them, but what fun would that be?

Instead, we have created this simple process with a small formula to calculate exactly how many odd numbers there are between 2 and 54.

We start by determining the first odd number and last odd number between 2 and 54. The numbers between 2 and 54 start with 3 and end with 53. That means that the first odd number is 3 and the last odd number is 53.

Now you add 2 to the difference of the last odd number and the first odd number, and then divide the sum by 2. Here is the formula and the answer to "How many odd numbers between 2 and 54?"

N = (Last - First + 2) ÷ 2
N = (53 - 3 + 2) ÷ 2
N = 52 ÷ 2
N = 26
Odd numbers between 2 and 54 = 26


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