If you add

**1 to 100**, you have 101. Then if you add 2**to**99, you also get 101. See a pattern?**1**+**100**2 + 99 3 + 98 (...) 50 + 51 Basically, you have 50 operations that add**to**101 each, so the total is 5050.11 Answers · Science & Mathematics · 18/08/2008

you DO have

**to**count 51, 52 etc and you can compute the total in a much simpler...doesn't change # of 5's) in each of the 2 columns,**1**/10 of the**100**digits will be 5, so 2 ***1**/10 ***100**= 20 <...5 Answers · Science & Mathematics · 10/08/2011

12.

1 Answers · Entertainment & Music · 02/02/2015

... which each add up

**to 100**for a total of 4900 Then all you have**to**do is add what is left, the 50 and the**100**4900 +**100**+ 50 =5050 There's a general formula for this: n(n+**1**)/2 =**100***101/2 = 50 * 101 = 50503 Answers · Science & Mathematics · 26/10/2013

Obama

**100**McCain 2 Bush**1**11 Answers · Politics & Government · 06/06/2008

**1**m =**100**cm Scale 14 m**to**14 cm1 Answers · Science & Mathematics · 17/03/2014

There are at least 101 ways

**to**do this. http://www.jimloy.com/puzz/1234.htm2 Answers · Science & Mathematics · 17/07/2010

...for the sum of the first n terms of the series

**1**/k is ln(k+**1**). So you could go ln(201) - ln(**100**)**to**get pretty close**to**the answer.2 Answers · Education & Reference · 06/11/2010

The #

**1**thing you can do**to**go faster is improve your stroke mechanics...a long VERY SPECIFIC explanation of how**to**swim a**100**yd race. If you apply what I wrote, your...3 Answers · Sports · 08/02/2012

It was just a trick using one $

**1**and one $**100**. You wouldn't find any poor people if everyone could do this. And eventually, even $**100**would only be worth what $**1**is now.3 Answers · Society & Culture · 09/06/2008