mindsplosion. how does this even work?.. Mind blown
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[ 84 comments ]
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#22 - derangedberger ONLINE (09/22/2013) [-]
Mind blown
User avatar #20 - kingofdogs (09/22/2013) [+] (4 replies)
I ain't learning **** from a sand ****** , who knows if it's truth or lie?
#24 to #20 - shitflippingpattie (09/22/2013) [-]
Our current number system is Arabic. You can go back to drawing lines in the dirt with a stick, you racist redneck junk-monkey.
#3 - solarisofcelestia (09/21/2013) [-]
How'd that Arab figure that out? This might be an issue of national security.
How'd that Arab figure that out? This might be an issue of national security.
User avatar #21 - kimkve ONLINE (09/22/2013) [-]
Please do 47*63....

100-47 = 53
100-63 = 37

53+37 = 90
53*37 = **** !
User avatar #4 - godtherapist (09/21/2013) [+] (3 replies)
Gets a little harder when you are doing, lets say 74 and 81.
#34 - pomm (09/22/2013) [-]
Comment Picture
#77 - ilikecows **User deleted account** (09/22/2013) [-]
I still don't understand why Bin Laden is teaching us about maths   
   
maybe it's because the wtin towers look like number 11, and 11 is a number, which is maths...
I still don't understand why Bin Laden is teaching us about maths

maybe it's because the wtin towers look like number 11, and 11 is a number, which is maths...
User avatar #71 - malkotay (09/22/2013) [+] (1 reply)
Yeah like 49*51 .... so : 100-49 = 51 , 100-51 = 49 ,

51*49 = ... dammit
User avatar #64 - setfire (09/22/2013) [-]
algebraic proof for those who cares..:
(100 - a) * (100 - b)
(10000 - (a+b)*100 + a*b) <= *foil
[10000 - (a+b)*100] + [a*b]
[100-(a+b) ]*100 + [a*b]

thus if a = 3, b = 4 (like the picture above...)

[100 - (3 + 4)] * 100 +(3*4)
(100 - 7) * 100 = 12
93*100 + 12
9312
User avatar #13 - rainbowisbestpone (09/22/2013) [-]
let's see if it works on larger numbers

300x200

1000-300=700
1000-200=800

700+800=1500

1000-1500=-500

700x800=560000

-500*1000=-500000
-500000
+560000
=60000
#65 - anonexplains (09/22/2013) [+] (4 replies)
Why the **** do you have a god damn terrorist teaching this?
User avatar #68 to #65 - ScottP (09/22/2013) [-]
Because the Arabs were the ones who more or less developed Mathematics after the Greeks/Romans
#55 - anonexplains (09/22/2013) [+] (1 reply)
youre telling me people didnt learn this already in middle school?
#74 to #55 - mcnigster (09/22/2013) [-]
not everyone gets good teachers u slut, i aint ever learned that **** before until achmed over here taught me
#33 - tarekmig (09/22/2013) [-]
How bin laden used to know how much ammo he needs for his kill streaks

This is sand ****** math, i ain't gonna explain **** .
#8 - adamks (09/22/2013) [+] (6 replies)
10 x 10
90 + 90 = 180 => 100-180 = -80
90 x 90 = 8100
Therefore
10 x 10 = -808100
User avatar #9 to #8 - rainbowisbestpone (09/22/2013) [-]
-8000
+8100
= 100
+1
#80 - mytwocents has deleted their comment [+] (3 replies)
#44 - cdsams (09/22/2013) [-]
Do this with any multiplication problem.
User avatar #40 - PEDOBEARKIDS (09/22/2013) [+] (15 replies)
import java.util.Scanner;
public class ******** {
public static void main(String args[]){
int firstNum; //1st number to multiply by
int secondNum; //2nd number to multiply by
int firstNumminus; //1st number - 100
int secondNumminus; //2nd number - 100
int numMinusadded; //1st and 2nd numbers added
int numMinusmultiplied; //1st and 2nd numbers multiplied
int lastNumsminus;
Scanner in = new Scanner(System.in);
System.out.println("enter the first number you want to multiply by");
firstNum = in.nextInt();
System.out.println("enter the second number you want to multiply by");
secondNum = in.nextInt();
firstNumminus = 100 - firstNum;
secondNumminus = 100 - secondNum;
numMinusadded = firstNumminus + secondNumminus;
numMinusmultiplied = firstNumminus * secondNumminus;
lastNumsminus = 100 - numMinusadded;
System.out.println(firstNum+" + "+secondNum+" = "+lastNumsminus+numMinusmultiplied);

ive only tried the example from the picture but it works
#35 - fuckyosixtyminutes (09/22/2013) [-]
It's almost as if (x-a) * (x-b) = X^2 - (a+b)x + ab.

To answer the description, In this case a and b are small and X is 100 so it's easy but it's not like it's anything magical. And it only works for numbers near 100 anyway. Well, rather it's only easy for numbers near 100.
#6 - gangbangtime (09/22/2013) [+] (1 reply)
55 X 60 = ?
User avatar #16 to #6 - rainbowisbestpone (09/22/2013) [-]
100-55=45
100-60=40

100-85=15
45x40=1800

15*100=1500
1500+1800=3300
55*60=3300
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