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

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 Click here to see ALL problems on Linear Equations And Systems Word Problems Question 634525: 1+2+3+4+5+6+7+8+9+10+..........+97+98+99Answer by Alan3354(30959)   (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