find a quick, easy metod to compute the first 100 number, fr

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babyZ
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find a quick, easy metod to compute the first 100 number, fr

Postby babyZ » Wed Apr 01, 2009 12:55 pm

i am stuck the question is, Find a quick, easy method to compute the first 100 number, from 1 to 100. I can`t use a calculator as a metod for this problem

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Martingale
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Re: find a quick, easy metod to compute the first 100 number, fr

Postby Martingale » Wed Apr 01, 2009 1:32 pm

babyZ wrote:i am stuck the question is, Find a quick, easy method to compute the first 100 number, from 1 to 100. I can`t use a calculator as a metod for this problem


What do you mean by 'compute the first 100 number'?

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Re: find a quick, easy metod to compute the first 100 number, fr

Postby babyZ » Fri Apr 03, 2009 11:25 pm

plus them all together

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Martingale
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Re: find a quick, easy metod to compute the first 100 number, fr

Postby Martingale » Fri Apr 03, 2009 11:45 pm

babyZ wrote:plus them all together



the sum of the first n numbers is given by n(n+1)/2

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stapel_eliz
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Postby stapel_eliz » Sat Apr 04, 2009 12:44 am

In case you're not familiar wtih variables yet, see if you can find the pattern here:

1 + 100 = 101
2 + 99 = 101
3 + 98 = 101
...

How many of these pairs are there? What is their sum? Does this account for all of the numbers between 1 and 100?

:wink:

babyZ
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Re: find a quick, easy metod to compute the first 100 number, fr

Postby babyZ » Sat Apr 04, 2009 1:34 pm

50x101=5050
thnx


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