SOLUTION: 1+2+3+4+5+6+7+8+9+10+..........+97+98+99

Algebra ->  Algebra  -> Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: 1+2+3+4+5+6+7+8+9+10+..........+97+98+99      Log On

Ad: You enter your algebra equation or inequality - Algebrator solves it step-by-step while providing clear explanations. Free on-line demo .
Ad: Algebra Solved!™: algebra software solves algebra homework problems with step-by-step help!
Ad: Algebrator™ solves your algebra problems and provides step-by-step explanations!

   

Question 634525: 1+2+3+4+5+6+7+8+9+10+..........+97+98+99
Answer by Alan3354(30959) About Me  (Show Source):
You can put this solution on YOUR website!
1+2+3+4+5+6+7+8+9+10+..........+97+98+99
----------
That's the sum of 99 numbers. Put a zero in front:
0+1+2+3+4+5+6+7+8+9+10+..........+97+98+99
Now there are 100 numbers.
Make them 50 pairs: 0+99, 1+98, 2+97, etc
--> 50 pairs, each pair is 99
50*99 = 4950
============
Or use Excel