What is the sum of the first 69 odd numbers?

Sum of the first 69 odd numbers

"The sum of the first 69 odd numbers" means that we want to add together the first 69 positive odd numbers. The list of the first 69 odd numbers starts with 1 and ends with 137. Thus, this is what we know:

Numbers = 69
First = 1
Last = 137

Below is the formula, calculation, and answer to "the sum of the first 69 odd numbers?":

(Numbers/2) x (First + Last)
(69/2) x (1 + 137)
= 4761

The method above requires us to first figure out what the last number is on the list of the first 69 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 69 odd numbers is:

69² = 4761

Sum of Odd Numbers Calculator
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What is the sum of the first 70 odd numbers?
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