"The sum of the first 9965 odd numbers" means that we want to add together the first 9965 positive odd numbers. The list of the first 9965 odd numbers starts with 1 and ends with 19929. Thus, this is what we know:
Numbers = 9965
First = 1
Last = 19929
Below is the formula, calculation, and answer to "the sum of the first 9965 odd numbers?":
(Numbers/2) x (First + Last)
(9965/2) x (1 + 19929)
= 99301225
The method above requires us to first figure out what the last number is on the list of the first 9965 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 9965 odd numbers is:
99652 = 99301225
Sum of Odd Numbers Calculator
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