What is the sum of the first 4005 odd numbers?

Sum of the first 4005 odd numbers

"The sum of the first 4005 odd numbers" means that we want to add together the first 4005 positive odd numbers. The list of the first 4005 odd numbers starts with 1 and ends with 8009. Thus, this is what we know:

Numbers = 4005
First = 1
Last = 8009

Below is the formula, calculation, and answer to "the sum of the first 4005 odd numbers?":

(Numbers/2) x (First + Last)
(4005/2) x (1 + 8009)
= 16040025

The method above requires us to first figure out what the last number is on the list of the first 4005 odd numbers. We like the formula method above, but there is an alternate faster way to add up odd numbers. You can get the answer fast by squaring the number. Once again, the sum of the first 4005 odd numbers is:

4005² = 16040025

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