How many even numbers between 1 and 41? How many even numbers between 1 and 41? You could just make a list of all the even numbers between 1 and 41 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 even numbers there are between 1 and 41.

We start by determining the first even number and last even number between 1 and 41. The numbers between 1 and 41 start with 2 and end with 40. That means that the first even number is 2 and the last even number is 40.

Now you add 2 to the difference of the last even number and the first even number, and then divide the sum by 2. Here is the formula and the answer to "How many even numbers between 1 and 41?"

N = (Last - First + 2) ÷ 2
N = (40 - 2 + 2) ÷ 2
N = 40 ÷ 2
N = 20
Even numbers between 1 and 41 = 20

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