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#1 2014-01-14 04:25:23

bronxsystem
Member
Registered: 2013-06-22
Posts: 63

square root of irrational number

im so lost. I have been staring at this page for over an hour.

im stuck on step 3

b1a0b970bdb31e8f4770508d25879ee0.png

i need to find the square root of 23749.98

#step 1 first we write it in pairs starting left from decimal point and to the right of decimal point easy
#step 2 then find a perfect square of 2 and book says only 1 is smaller so i place the 1 above and below radical (not sure if right word)

STEP #3  next i thought we had to see how many times 2 would go into the first two digits of the new radicand 1 37 ?? so 2 goes into 13 = 6 times why is this book saying 5 times arghh i dont get it >< plz aware me

Last edited by bronxsystem (2014-01-14 04:30:37)

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#2 2014-01-14 04:46:10

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 86,161

Re: square root of irrational number

Hi bronxsystem;

That method is so bad I would only use it if they put a gun to my head. Luckily, it is one of the bad things in my life that I no longer remember. I can not teach it to you and you should wait until someone else comes in who can do it.

In the meantime, check this page out:

http://www.homeschoolmath.net/teaching/ … orithm.php


In mathematics, you don't understand things. You just get used to them.
Of course that result can be rigorously obtained, but who cares?
Combinatorics is Algebra and Algebra is Combinatorics.

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#3 2014-01-14 05:00:17

bronxsystem
Member
Registered: 2013-06-22
Posts: 63

Re: square root of irrational number

phew lol my brain was going to explode like trying to squeeze a triangle into a circle hole.

thanks for the link but any chance you can take a glance at this method
http://mathforum.org/library/drmath/view/52610.html

it seems simple and i got the hang of it pretty quickly

i will go through the link you sent now thank you very much

EDIT : both seem really similar ^^

Last edited by bronxsystem (2014-01-14 05:04:31)

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#4 2014-01-14 05:07:45

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 86,161

Re: square root of irrational number

Hi;

That looks like the same method.

it seems simple and i got the hang of it pretty quickly

If you got it from that page and understand it then use it.


In mathematics, you don't understand things. You just get used to them.
Of course that result can be rigorously obtained, but who cares?
Combinatorics is Algebra and Algebra is Combinatorics.

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#5 2014-01-14 05:14:31

bronxsystem
Member
Registered: 2013-06-22
Posts: 63

Re: square root of irrational number

awesome (:

thanks

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#6 2014-01-14 05:15:29

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 86,161

Re: square root of irrational number

Hi;

If you want to use something better look here.

http://www.mathsisfun.com/square-root.html

It is under "A Fun Way to Calculate a Square Root"


In mathematics, you don't understand things. You just get used to them.
Of course that result can be rigorously obtained, but who cares?
Combinatorics is Algebra and Algebra is Combinatorics.

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