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Old January 29th, 2004, 09:13 PM
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Default Amazing Math ( to keep your mind alert!)



I got this in an e-mail. It is completely amazing! Whether you're a math whiz, or a math dunce, like me, you will love it!

Unbelievable Math

Here is a math trick so unbelievable that it will stump you. Personnally
I would like to know who came up with this and why that person is not
running the country.

1. Grab a calculator. (you won't be able to do this one in your xhead)
2. Key in the first three digits of your phone number (NOT the area code)
3. Multiply by 80
4. Add 1
5. Multiply by 250
6. Add the last 4 digits of your phone number
7. Add the last 4 digits of your phone number again.
8. Subtract 250
9. Divide number by 2

donna

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Old January 29th, 2004, 09:46 PM
cruisinKandJ
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Default Re: Amazing Math ( to keep your mind alert!)

Donna, you're right; it's cool!

On another subject, I don't know if you saw my response to your posting this a.m. about the weather, but I wanted to tell you that my husband and I were in Montreal a couple of years ago, and we loved it. We went on a Canada-New England cruise on HAL's Rotterdam out of Boston. But that was in June, not January!

I was born and raised in Minnesota, and I figure I shoveled my share pf snow along with my Dad.

J.
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Old January 30th, 2004, 10:56 AM
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Default Re: Amazing Math ( to keep your mind alert!)

That is a cool trick, Donna!

It is a category of number trick I call "the hidden nines." Nine has a pseudo-magical property in that all of its multiples result in numbers that consist of digits that added together equal 9. For example: 9x2=18; 1+8=9. 23x9 = 207; 2+0+7 = 9.

The other factors, addends, etc. in the puzzle cammouflage the fact that your actually multiplying, dividing, adding, and subtracting nine. Most number tricks I've seen focus on that process, so that with the final division by 2, you get that apparently stunning result.

Again--that is a cool trick! Thanks!

Steve



Sensation 2/03 I disembarked, but never really left the ship.
Enchantment 9/03 Just had to go back.
Inspiration 3/04 Just have to go back again, and again, and again...
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Old January 30th, 2004, 12:09 PM
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Default Re: Amazing Math ( to keep your mind alert!)

It really is mathematical trickery and can be done in a number of ways, but let me show you how it works.

Suppose your first three numbers of your phone number are represented by "K" and your last 4 numbers are represented by "L".

The formula then is:

[(((K)(80)+1)250)+L+L-250] /2=

Completing the calculations then reveals the following formula:

(250)(80)(K)+250+2L-250 divided by 2

Both 250's cancel each other right, you are adding one and subtracting one! So now you have after dividing by 2:

(125)(80)(K)+L = 10,000(K)+L

So you see, it doesn't matter what the first 3 numbers are of your phone number it will always be the three digit number followed by 4 zeros, i.e. if your first three numbers are 275, the first part will be 2750000. And then when you add the last 4 numbers to it you get your 2756632, for instance.

Regards,
Thomas
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Old January 30th, 2004, 12:35 PM
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Default Re: Amazing Math ( to keep your mind alert!)

Thomas i was going to post that same formula. I'm glad you beat me to it! No doubt, I would misplace a bracket or parenthesis and have to re-edit for the rest of the day before it looked right.--kinda the way I have to typing mere words!

Steve



Sensation 2/03 I disembarked, but never really left the ship.
Enchantment 9/03 Just had to go back.
Inspiration 3/04 Just have to go back again, and again, and again...
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Old January 30th, 2004, 02:34 PM
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Default Re: Amazing Math ( to keep your mind alert!)

Hi Donna,
Someone at work just showed me that, and yes I was amazed!!

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Old January 30th, 2004, 03:34 PM
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Default Re: Re: Amazing Math ( to keep your mind alert!)

O.K. Steve, how about 11x9=99 ?

Regards,
Thomas
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Old January 30th, 2004, 04:17 PM
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Default Re: Re: Re: Amazing Math ( to keep your mind alert!)

Easy 11x9 = 99; 9+9 = 18; 1+ 8 = 9. Any multiple of nine into infinity will do that. Try random numbers x 9. Just continue to add the resulting digits.

Also here's some fun with prime numbers. Every known prime number fuffills the formula: (6x +/ - 1); in other words every known prime number is equal to one more or one less than a multiple of 6. (2 x sqrt of 9).

As an experiment, multiply any number x 6, add one to it then factor it out. Try again subtracting 1. One of those numbers, when factored out, will show as a string of prime number factors. Example (2x2x3x3) +1 = 37

Occasionally throughout the positive integers you'll find cases where prime numbers fulfill both possibilities. The lowest of those are 5 and 7

5 = (2x3) -1
7 = (2x3)+1

The next ones up are 17 & 19.
17 = (2x3x3) -1
19 = (2x3x3)+1

The next highest are 41 & 43.
41 = (2x3x7) - 1
43 = (2x3x7) + 1

It's up to you to find more. Enjoy.

Steve



Sensation 2/03 I disembarked, but never really left the ship.
Enchantment 9/03 Just had to go back.
Inspiration 3/04 Just have to go back again, and again, and again...

Post Edited (01-30-04 15:25)
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Old January 30th, 2004, 10:24 PM
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Default Re: Amazing Math ( to keep your mind alert!)

Thomas, you lost me after my first 3 numbers = K. There's a reason why I never passed Math..... I prefer to be amazed and pretend it was magic!

donna

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Old January 31st, 2004, 11:35 AM
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Default Re: Amazing Math ( to keep your mind alert!)

Hey, Donna! I don't care about all of Steve's & Thomas's fancy solutions. I just want to know how you and your little trick knew my telephone number. It's unpublished!! {grin}

Jack

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Old February 1st, 2004, 09:00 AM
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Default Re: Re: Amazing Math ( to keep your mind alert!)

Donna, the solution is to get you to multiply your first three numbers of your phone number by 10,000. That's it! Then when it says to add the last 4 digits of your phone number to it, you have your phone number! Viola!

Steve, I see what you mean about the 9's, I thought you had claimed that any product of a nine multiple will add up to 9.


Regards,
Thomas
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