What is the sum of integers 1 thru 10?
I tried doing the math, isn't is 55? because 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 = 1 + 10 ( 2 + 9) (3 + 8) (4 + 7) (5 + 6) ( 6 + 5) (7 + 4) ( 8 + 3) (9 + 2) (10 + 1) = 11 + 11 + 11 + 11 + 11 = 11*5 = 55
sum 1 to 10.
Or
10
1+9=10
2+8=10
3+7=10
4+6=10
+5
=55
There is a simple and elegant shortcut when it comes to adding consecutive integers.It works like this: Take the last term, 10 in this case, add 1 to it and then multiply and divide by 2. So, we have:
[10 x 11] / 2 = 55.
+183 
