# Help with basic math

Discussion in 'Computer Support' started by news.btinternet.com, Sep 18, 2007.

1. ### news.btinternet.comGuest

Hi,
my kid is doing maths and I am watching over but absolutely useless.
we have a problem and the answer and trying to find the way to the answer.
we manages most of the questions but one I just cannot get.

2 divided by square root of 10 gets us to square root of 10 divided by 5.

How on earth did the square root go from bottom to top......
simple, step by step welcome!
Cheers
Ant

news.btinternet.com, Sep 18, 2007

2. ### Mike EasterGuest

news.btinternet.com wrote:

> 2 divided by square root of 10 gets us to square root of 10 divided
> by 5.

Multiply the numerator & denominator by the square root of ten and then
reduce the fraction 2/10 to 1/5.

For easy ascii, let the square root of 10 be expressed as R

2/R X R/R = 2R/Rsquared

The square root of 10 squared is 10.

2R/10 = R/5 or the square root of 10 divided by 5.

--
Mike Easter

Mike Easter, Sep 18, 2007

3. ### meerkatGuest

"news.btinternet.com" <> wrote in message
news:...
> Hi,
> my kid is doing maths and I am watching over but absolutely useless.
> we have a problem and the answer and trying to find the way to the
> answer.
> we manages most of the questions but one I just cannot get.
>
> 2 divided by square root of 10 gets us to square root of 10 divided
> by 5.
>
> How on earth did the square root go from bottom to top......
> simple, step by step welcome!
> Cheers
> Ant

square root(10) = 3.16227766

so 2 divided by etc

Bookmark this site for his maths
http://www.google.com/search?q=define square root(10) = 3.16227766

meerkat, Sep 18, 2007
4. ### news.btinternet.comGuest

Hi,
Many thanks.... surprisingly enough... I understood your explanation!
Am very good at French if that can help one day!
Ant
"Mike Easter" <> wrote in message
news:...
> news.btinternet.com wrote:
>
>> 2 divided by square root of 10 gets us to square root of 10 divided
>> by 5.

>
> Multiply the numerator & denominator by the square root of ten and then
> reduce the fraction 2/10 to 1/5.
>
> For easy ascii, let the square root of 10 be expressed as R
>
> 2/R X R/R = 2R/Rsquared
>
> The square root of 10 squared is 10.
>
> 2R/10 = R/5 or the square root of 10 divided by 5.
>
> --
> Mike Easter
>
>

news.btinternet.com, Sep 18, 2007
5. ### who'sthatGuest

On Tue, 18 Sep 2007 16:58:17 +0100, "news.btinternet.com"
<> wrote:

>Hi,
>my kid is doing maths and I am watching over but absolutely useless.
>we have a problem and the answer and trying to find the way to the answer.
>we manages most of the questions but one I just cannot get.
>
>2 divided by square root of 10 gets us to square root of 10 divided by 5.
>
>How on earth did the square root go from bottom to top......
>simple, step by step welcome!
>Cheers
>Ant
>

I find it hard to believe your kid is doing maths(?) (with his math
book) and there isn't an example.
http://www.curriki.org

who'sthat, Sep 18, 2007
6. ### news.btinternet.comGuest

There are some examples of basic simplification, but out of the 20
exercices, this one elluded us.....
sorry if we are not perfect at Math!!!
"who'sthat" <who'sthat@don'tknow.com> wrote in message
news...
> On Tue, 18 Sep 2007 16:58:17 +0100, "news.btinternet.com"
> <> wrote:
>
>>Hi,
>>my kid is doing maths and I am watching over but absolutely useless.
>>we have a problem and the answer and trying to find the way to the answer.
>>we manages most of the questions but one I just cannot get.
>>
>>2 divided by square root of 10 gets us to square root of 10 divided by 5.
>>
>>How on earth did the square root go from bottom to top......
>>simple, step by step welcome!
>>Cheers
>>Ant
>>

> I find it hard to believe your kid is doing maths(?) (with his math
> book) and there isn't an example.
> http://www.curriki.org
>

news.btinternet.com, Sep 18, 2007
7. ### Evan PlattGuest

On Tue, 18 Sep 2007 11:44:17 -0500, who'sthat
<who'sthat@don'tknow.com> wrote:

>I find it hard to believe your kid is doing maths(?) (with his math
>book) and there isn't an example.
>http://www.curriki.org

I believe 'maths' is a limey expression.
--
To reply via e-mail, remove The Obvious from my e-mail address.

Evan Platt, Sep 18, 2007
8. ### Blinky the SharkGuest

Evan Platt wrote:

> On Tue, 18 Sep 2007 11:44:17 -0500, who'sthat
> <who'sthat@don'tknow.com> wrote:
>
>>I find it hard to believe your kid is doing maths(?) (with his

math
>>book) and there isn't an example.
>>http://www.curriki.org

>
> I believe 'maths' is a limey expression.

Yes, they come in all colors and sizes over there.

--
Blinky
Killing all posts from Google Groups
The Usenet Improvement Project:
http://improve-usenet.org <------------- New Site Aug 28

Blinky the Shark, Sep 18, 2007
9. ### WhiskersGuest

On 2007-09-18, news.btinternet.com <> wrote:
> There are some examples of basic simplification, but out of the 20
> exercices, this one elluded us.....
> sorry if we are not perfect at Math!!!

Now I'm puzzled; why is

"the square root of 10, divided by 5"

'simpler' than

"2, divided by the square root of 10"?

There might be some point in being given

2 ÷ X = X ÷ 5

and being asked to find the value of X; or even being asked to 'prove'
that the two expressions have the same value. But both expressions are
equally 'simple' as far as I can see.

--
-- ^^^^^^^^^^
-- Whiskers
-- ~~~~~~~~~~

Whiskers, Sep 18, 2007
10. ### who'sthatGuest

On Tue, 18 Sep 2007 19:51:40 +0100, Whiskers
<> wrote:

>On 2007-09-18, news.btinternet.com <> wrote:
>> There are some examples of basic simplification, but out of the 20
>> exercices, this one elluded us.....
>> sorry if we are not perfect at Math!!!

>
>Now I'm puzzled; why is
>
> "the square root of 10, divided by 5"
>
>'simpler' than
>
> "2, divided by the square root of 10"?
>
>There might be some point in being given
>
> 2 ÷ X = X ÷ 5
>
>and being asked to find the value of X; or even being asked to 'prove'
>that the two expressions have the same value. But both expressions are
>equally 'simple' as far as I can see.

Looks solved to me. I'll ask my daughter when she gets in

who'sthat, Sep 18, 2007
11. ### Mike EasterGuest

Whiskers wrote:

> Now I'm puzzled; why is
>
> "the square root of 10, divided by 5"
>
> 'simpler' than
>
> "2, divided by the square root of 10"?

Because it is easier to calculate it to a million places?
http://antwrp.gsfc.nasa.gov/htmltest/gifcity/sqrt10.1mil What follows
are the first 1 million digits of the square root of 10.

That is, if I had to calculate a value to a million places, I would much
rather be dividing *into* a million place value with 5 than dividing 2
by a million place figure and calculated to a million places.

However, in the case of 10 and a decimal system, we could take a short
cut and just mulitply 2x the *reciprocal* of the square root of 10,
which is the same million digits with the decimal place moved over to
the left.

--
Mike Easter

Mike Easter, Sep 18, 2007
12. ### MandyGuest

"Evan Platt" <> wrote in message
news:...
> On Tue, 18 Sep 2007 11:44:17 -0500, who'sthat
> <who'sthat@don'tknow.com> wrote:
>
>>I find it hard to believe your kid is doing maths(?) (with his math
>>book) and there isn't an example.
>>http://www.curriki.org

>
> I believe 'maths' is a limey expression.

Yes, it's short for mathematics....

Mandy, Sep 18, 2007
13. ### William PoasterGuest

It was on, or about, Tue, 18 Sep 2007 18:42:15 +0000, that as I was
halfway through a large jam doughnut, Blinky the Shark wrote:

> Evan Platt wrote:
>
>> On Tue, 18 Sep 2007 11:44:17 -0500, who'sthat <who'sthat@don'tknow.com>
>> wrote:
>>
>>>I find it hard to believe your kid is doing maths(?) (with his

> math
>>>book) and there isn't an example.
>>>http://www.curriki.org

>>
>> I believe 'maths' is a limey expression.

>
> Yes, they come in all colors and sizes over there.

That's because the word is 'mathematics' not 'mathematic'.

William Poaster, Sep 18, 2007
14. ### William PoasterGuest

Evan Platt wrote:

> On Tue, 18 Sep 2007 11:44:17 -0500, who'sthat
> <who'sthat@don'tknow.com> wrote:
>
>>I find it hard to believe your kid is doing maths(?) (with his math
>>book) and there isn't an example.
>>http://www.curriki.org

>
> I believe 'maths' is a limey expression.

That is correct, Yank.

--
Operating systems:
FreeBSD 6.2, Debian 4.0
PCLinuxOS 2007, (K)Ubuntu 7.04
Ubuntu 7.10 "Gutsy" alpha - Tribe 5

William Poaster, Sep 18, 2007
15. ### Blinky the SharkGuest

William Poaster wrote:

> It was on, or about, Tue, 18 Sep 2007 18:42:15 +0000, that as I
> was halfway through a large jam doughnut, Blinky the Shark
> wrote:
>
>> Evan Platt wrote:
>>
>>> On Tue, 18 Sep 2007 11:44:17 -0500, who'sthat
>>> <who'sthat@don'tknow.com> wrote:
>>>
>>>>I find it hard to believe your kid is doing maths(?) (with his

>> math
>>>>book) and there isn't an example.
>>>>http://www.curriki.org
>>>
>>> I believe 'maths' is a limey expression.

>>
>> Yes, they come in all colors and sizes over there.

>
> That's because the word is 'mathematics' not 'mathematic'.

I'm fully aware of "mathematics".

--
Blinky
Killing all posts from Google Groups
The Usenet Improvement Project:
http://improve-usenet.org <------------- New Site Aug 28

Blinky the Shark, Sep 18, 2007
16. ### MaraGuest

On 18 Sep 2007 22:41:21 GMT, Blinky the Shark <> wrote:

>William Poaster wrote:
>
>> It was on, or about, Tue, 18 Sep 2007 18:42:15 +0000, that as I
>> was halfway through a large jam doughnut, Blinky the Shark
>> wrote:
>>
>>> Evan Platt wrote:
>>>
>>>> On Tue, 18 Sep 2007 11:44:17 -0500, who'sthat
>>>> <who'sthat@don'tknow.com> wrote:
>>>>
>>>>>I find it hard to believe your kid is doing maths(?) (with his
>>> math
>>>>>book) and there isn't an example.
>>>>>http://www.curriki.org
>>>>
>>>> I believe 'maths' is a limey expression.
>>>
>>> Yes, they come in all colors and sizes over there.

>>
>> That's because the word is 'mathematics' not 'mathematic'.

>
>I'm fully aware of "mathematics".

And I'm fully aware that the word "limey" is a stereotypical epithet.

--
A luser is someone who returns a perfectly good hammer to the hardware
store saying "There's something wrong with it.  I keep hitting my
thumb." --JB, in the Monastery

Mara, Sep 19, 2007
17. ### WhiskersGuest

On 2007-09-18, Mike Easter <> wrote:
> Whiskers wrote:
>
>> Now I'm puzzled; why is
>>
>> "the square root of 10, divided by 5"
>>
>> 'simpler' than
>>
>> "2, divided by the square root of 10"?

>
> Because it is easier to calculate it to a million places?
> http://antwrp.gsfc.nasa.gov/htmltest/gifcity/sqrt10.1mil What follows
> are the first 1 million digits of the square root of 10.
>
> That is, if I had to calculate a value to a million places, I would much
> rather be dividing *into* a million place value with 5 than dividing 2
> by a million place figure and calculated to a million places.

I'll be in touch next time I need that doing, then!

> However, in the case of 10 and a decimal system, we could take a short
> cut and just mulitply 2x the *reciprocal* of the square root of 10,
> which is the same million digits with the decimal place moved over to
> the left.

<smile> A million decimal places isn't what I call simple; for root ten
I'm happy with 'three and a bit' although I can 'iterate' in my head if I
need two or three decimals. I don't need the raw number often enough to
have memorised a value for it. But then I'm not trying to plot ballistic
trajectories across the solar system or build nuclear reactors )

Perhaps the real lesson is that 'some numbers are pretty weird'.

--
-- ^^^^^^^^^^
-- Whiskers
-- ~~~~~~~~~~

Whiskers, Sep 19, 2007
18. ### Mike EasterGuest

Whiskers wrote:
> Mike Easter

>> the first 1 million digits of the square root of 10.

> Perhaps the real lesson is that 'some numbers are pretty weird'.

Transcendental has a nice ring to it. Like Zen. Irrational sounds
zany.

--
Mike Easter

Mike Easter, Sep 19, 2007
19. ### Blinky the SharkGuest

Mara wrote:

> On 18 Sep 2007 22:41:21 GMT, Blinky the Shark
> <> wrote:
>
>>William Poaster wrote:
>>
>>> It was on, or about, Tue, 18 Sep 2007 18:42:15 +0000, that as
>>> I was halfway through a large jam doughnut, Blinky the Shark
>>> wrote:
>>>
>>>> Evan Platt wrote:
>>>>
>>>>> On Tue, 18 Sep 2007 11:44:17 -0500, who'sthat
>>>>> <who'sthat@don'tknow.com> wrote:
>>>>>
>>>>>>I find it hard to believe your kid is doing maths(?) (with
>>>>>>his
>>>> math
>>>>>>book) and there isn't an example.
>>>>>>http://www.curriki.org
>>>>>
>>>>> I believe 'maths' is a limey expression.
>>>>
>>>> Yes, they come in all colors and sizes over there.
>>>
>>> That's because the word is 'mathematics' not 'mathematic'.

>>
>>I'm fully aware of "mathematics".

>
> And I'm fully aware that the word "limey" is a stereotypical
> epithet.

And I'm fully aware that I didn't use it.

Even though it's not any more derogatory in and of itself than
"Yank". "Limey" derives from the Royal Navy's discovery that on
long voyages there was much less scurvy, which was a huge problem,
if the crews were given a healthy ration of limes (for the citric
acid).

--
Blinky
Killing all posts from Google Groups
The Usenet Improvement Project:
http://improve-usenet.org <------------- New Site Aug 28

Blinky the Shark, Sep 19, 2007
20. ### Mike EasterGuest

Blinky the Shark wrote:

> Even though it's not any more derogatory in and of itself than
> "Yank". "Limey" derives from the Royal Navy's discovery that on
> long voyages there was much less scurvy, which was a huge problem,
> if the crews were given a healthy ration of limes (for the citric
> acid).

I suppose any term could be derogatory or not derogatory depending upon
the context and 'attitude' with which it is delivered; my friends in
the US who are Brits and who are also called 'limey' do not find it
derogatory at all. It seems to be like Oz or Kiwi for Aussies and
NZers.

--
Mike Easter

Mike Easter, Sep 19, 2007

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