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Math maniac
#1
I usually do some funny calculations when i am bored. So, i recently heard an information that people in our country wont usually purchase the register number for vehicles which adds up to 8 . For example

An example number:

TN 56 FZ 2267.

Add numbers in 2267 => 2+2+6+7=17 . Add numbers in 17 => 1+7 =8. Let us call this operation as Add() functions as like in C programming. ( For future use)

Like that.

So by this i came to figure out something. An interesting fact. Don't know whether you might know this already but I am bound to tell it because it is interesting.

Suppose i give you a number 3699. Add numbers in 3699

3+6+9+9 = 27. Add numbers in 27 you get 2+7=9. So simple as it is , but do u see something very common?

When ever we perform Add() function , which involves a number '9' in it, we can perform it quickly with less effort.

I call Add() function for Number 69. the result is 6. Note the other number than 9. It is 6. so the result is same as the other number than 9. So whenever u find series of number before 9 or a string of number which contains 9, u add up the rest other than 9 and that will be the result when you perform Add() function. So the concept is pretty simple. YET ANOTHER CONCEPT.

I've also found something in common in multiples of five. what is 8x5? its 40. What is 6x5? its is 30. So what do you infer?.. 8x5=40 . 4 is half of 8 and 10 is multiplied with it. 6x5=30 where 3 is half of 6 and 10 is multiplied with it. So you can perform multiplication using five table easily than ever.

what is 124567345 x 5? = 622836725.

If you also know some funky concepts please feel free to post it.
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#2
6x5 = 6 x 10 / 2 --> 3 x 10 (so we replace 5 with 10/2 , which is actually your idea)
Like then, 27 x 25 = 27 x 100 / 4 --> {7 + (3/4)} x 100 = 775

I like such tricks too XD . When calculating, let's say 12 x 37, I prefer this way:
12 x 37 = 6 x 74 = 3 x 148 = 444

19 x 12 = (20 - 1) x 12 = 240 - 12 = 228 ( I think many people already know this though )



BTW
This is the MOST awesome math I ever seen - http://www.youtube.com/watch?v=daro6K6mym8

This is a cool idea ;D , estimating the value of PI using matches lol http://www.youtube.com/watch?v=sJVivjuMfWA


A little quiz, maybe too easy.
a/b = a/c, b <> c. What can you get? ( '<>' means not equal )

This is a stupid quiz I got from my friend. And I somehow failed to answer it D= .
(x - a)(x - b)(x - c)(x - d) .... (x - z) = ???
TEMPE
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#3
(05-12-2012, 05:24 AM)Kevin Wrote:  A little quiz, maybe too easy.
a/b = a/c, b <> c. What can you get? ( '<>' means not equal )
Age ratings for movies and games (and similar) have never been a good idea.
One can learn a lot from reinventing wheels.
An unsound argument is not the same as an invalid one.
volatile in C++ does not mean thread-safe.
Do not make APIs unnecessarily asynchronous.
Make C++ operator > again
Trump is an idiot.
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#4
(05-12-2012, 05:24 AM)Kevin Wrote:  This is a stupid quiz I got from my friend. And I somehow failed to answer it D= .
(x - a)(x - b)(x - c)(x - d) .... (x - z) = ???

(x - a)(x - b)(x - c)(x - d) .... (x - z) = 0

Explanation (Click to View)
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#5
hey, i am weak in maths.
Life is like a bicycle; to keep your balance, you must keep moving.
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#6
I don't understand most of the above mathemetical stuff.
Probably because I spent more time memorizing 752, 753, 754, 755 and 756 or something.

(this thread does include whatever those are called, right?)
The truth... is inescapable. The truth will always come out eventually, no matter what. And once the chains that bind the truth are severed... nothing can stop the truth from coming to light.
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