Sum of the first 101 odd numbers "The sum of the first 101 odd numbers" means that we want to add together the first 101 positive odd numbers. The list of the first 101 odd numbers starts with 1 and ends with 201. Thus, this is what we know:

Numbers = 101
First = 1
Last = 201

Below is the formula, calculation, and answer to "the sum of the first 101 odd numbers?":

(Numbers/2) x (First + Last)
(101/2) x (1 + 201)
= 10201

The method above requires us to first figure out what the last number is on the list of the first 101 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 101 odd numbers is:

1012 = 10201

Sum of Odd Numbers Calculator
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What is the sum of the first 102 odd numbers?
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