+0  
 
+1
299
4
avatar+183 

What is the sum of integers 1 thru 10?

PsychoBaker  Apr 29, 2017
edited by PsychoBaker  Apr 29, 2017
 #2
avatar+183 
+1

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

PsychoBaker  Apr 29, 2017
 #3
avatar+92781 
+1

sum 1 to 10.   

Or 

10

1+9=10

2+8=10

3+7=10

4+6=10

+5

=55

Melody  Apr 29, 2017
 #4
avatar
+1

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.

Guest Apr 30, 2017

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