# Kid's Math

Discussion in 'Computer Support' started by johndieb@gmail.com, Sep 20, 2007.

1. ### why?Guest

On Sat, 22 Sep 2007 05:31:22 -0400, phrogee wrote:

<snipped single line blanks>

>"why?" <fgrirp*sgc@VAINY!Qznq.fpvragvfg.pbz> wrote in message
>news:...
>> On 21 Sep 2007 02:35:55 GMT, Blinky the Shark wrote:
>>>why? wrote:
>>>> On Thu, 20 Sep 2007 19:19:02 GMT, dadiOH wrote:
>>>>> wrote:
>>>>>> Problem 2. Supply the missing numbers.
>>>>>> 120 60 180 90 _____ _____ 405
>>>>>Oh, all right...270 135
>>>> What's the point without how.
>>>The point is the kid learning how to do this himself.

>> Doesn't giving the answer avoid having to get the 'how'? Not posting
>> either was the point
>> Me

>Does this help?
>120 60 180 90 666 666 405. Obviously, the sequence is the polynomial

LOL 666 666

>(2990160 - 6888924 x + 5902372 x^2 - 2446935 x^3 + 525955 x^4 - 56181
>x^5 + 2353 x^6) / 240
>evaluated at x=1, x=2, x=3, etc.

Me

why?, Sep 22, 2007

why? wrote:
> On Sat, 22 Sep 2007 18:44:53 GMT, dadiOH wrote:
>
>> why? wrote:
>>> On Sat, 22 Sep 2007 10:58:37 GMT, dadiOH wrote:
>>>
>>>> why? wrote:
>>>>> On Thu, 20 Sep 2007 19:19:02 GMT, dadiOH wrote:
>>>>>
>>>>>> wrote:
>>>>>>
>>>>>>> Problem 2. Supply the missing numbers.
>>>>>>>
>>>>>>> 120 60 180 90 _____ _____ 405
>>>>>>
>>>>>> Oh, all right...270 135
>>>>>
>>>>> What's the point without how.
>>>>>
>>>>> Me
>>>>
>>>>
>>>> 1. sum of two preceding (180 + 90 = 270)
>>>> 2. result divided by 2 (270/2 = 135)
>>>
>>> It's simpler than that, don't need the addition, although it's an
>>> alternative option it wasn't the 1 I saw right away.
>>>
>>> I started with step 2 in place of your step 1. Then see what
>>> happens

>>
>> You mean...
>>
>> 1.5 * 90 = 135
>> 1.5 * 180 = 270

>
> Yes, only 1 operation the same for each pair.

Simpler, true. OTOH, it involves a decimal point and those can lead
to fried brains and that can lead to polynomials

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3. ### why?Guest

X-No-Archive: Yes
On Sun, 23 Sep 2007 11:29:11 GMT, dadiOH wrote:

>why? wrote:
>> On Sat, 22 Sep 2007 18:44:53 GMT, dadiOH wrote:
>>
>>> why? wrote:
>>>> On Sat, 22 Sep 2007 10:58:37 GMT, dadiOH wrote:
>>>>
>>>>> why? wrote:
>>>>>> On Thu, 20 Sep 2007 19:19:02 GMT, dadiOH wrote:
>>>>>>
>>>>>>> wrote:
>>>>>>>
>>>>>>>> Problem 2. Supply the missing numbers.
>>>>>>>>
>>>>>>>> 120 60 180 90 _____ _____ 405
>>>>>>>
>>>>>>> Oh, all right...270 135
>>>>>>
>>>>>> What's the point without how.

>>>>> 1. sum of two preceding (180 + 90 = 270)
>>>>> 2. result divided by 2 (270/2 = 135)
>>>>
>>>> It's simpler than that, don't need the addition, although it's an
>>>> alternative option it wasn't the 1 I saw right away.
>>>>
>>>> I started with step 2 in place of your step 1. Then see what
>>>> happens
>>>
>>> You mean...
>>>
>>> 1.5 * 90 = 135
>>> 1.5 * 180 = 270

>>
>> Yes, only 1 operation the same for each pair.

>
>Simpler, true. OTOH, it involves a decimal point and those can lead
>to fried brains and that can lead to polynomials

Okay so expand it to
/2 , *3 , /2 , *3 and so on.

Then you don't get decimals and you don't need to work on number pairs.

Me

why?, Sep 23, 2007
4. ### AardvarkGuest

On Sat, 22 Sep 2007 12:10:56 -0500, who'sthat wrote:

> But you have to choose the best answer.

The 'best' anything is always subjective.

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Aardvark, Sep 24, 2007
5. ### who'sthatGuest

On Sun, 23 Sep 2007 23:16:38 GMT, Aardvark <>
wrote:

>On Sat, 22 Sep 2007 12:10:56 -0500, who'sthat wrote:
>
>> But you have to choose the best answer.

>
>The 'best' anything is always subjective.

True. I guarantee that a polynomial is not the best answer to that
question

who'sthat, Sep 24, 2007