"The sum of the first 125 odd numbers" means that we want to add together the first 125 positive odd numbers. The list of the first 125 odd numbers starts with 1 and ends with 249. Thus, this is what we know:
Numbers = 125
First = 1
Last = 249
Below is the formula, calculation, and answer to "the sum of the first 125 odd numbers?":
(Numbers/2) x (First + Last)
(125/2) x (1 + 249)
= 15625
The method above requires us to first figure out what the last number is on the list of the first 125 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 125 odd numbers is:
1252 = 15625
Sum of Odd Numbers Calculator
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What is the sum of the first 126 odd numbers?
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