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...of consecutive integers, you must first find the middle number.

**To****do**this, you add the first and last number, and divide by two.**1**+**100**/ 2 = 55.5 Next, you must find the number of numbers (last...4 Answers · Education & Reference · 30/08/2010

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 · 03/02/2015

... 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

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