"The sum of the first 11 odd numbers" means that we want to add together the first 11 positive odd numbers. The list of the first 11 odd numbers starts with 1 and ends with 21. Thus, this is what we know:
Numbers = 11
First = 1
Last = 21
Below is the formula, calculation, and answer to "the sum of the first 11 odd numbers?":
(Numbers/2) x (First + Last)
(11/2) x (1 + 21)
= 121
The method above requires us to first figure out what the last number is on the list of the first 11 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 11 odd numbers is:
112 = 121
Sum of Odd Numbers Calculator
Do you need the answer to a similar question? Get the answer to the sum of the first n odd numbers here!
What is the sum of the first 12 odd numbers?
Here is the next set of odd numbers that we have added together for you.
Copyright | Privacy Policy | Disclaimer | Contact