Ethiopian / Russian Multiplication

[faouzi]

Hey everyone,
yesterday while i was checkin for some actionscript snippets, i bumpted into somethin really interestin, it was ethiopian/russian multiplication, this multiplication works as a binary system, u choose two numbers :
for example we will take 27 and 37 (27*35)
we make two colums :
we put 25 on the left and 37 on the right
27 = 13*2+1 so we take just twelve
13 = 6*2+1 we take 6 and we continue like that until we reach 2 or 1 this will be :
Now we take 35 and we multiply it by 2 , it will be something like that :

27 ----- 35
13 ----- 70
6 ----- 140
3 ----- 280
1 ----- 560

nOW We cross the numbers on the right which have on their left an even number (except 2).

That will be then : 560+280+70+35 = 945
And 13*35 = 945


For a live demo of the example above : [.::Hidden Content::. Click Here To Register]

You can also check my other examples Or simply You can use my automated system to calculate ur results using the engine i created to make the calculs ! from here : [.::Hidden Content::. Click Here To Register]


The page is created with asp.net/vb , took me more than 5 hours to make this engine
I forgot to say this was the first online ethiopian multiplication calculator on the web !

[youpoppedmybubble]

WOW!!! how did you even come across this??? i think i like normal multiplication... and do they actually do multiplication like that in russia/ethopia??? wow

[faouzi]

LOL I don't really know if they do it like that now, but i think they used to, i was checkin some flex and flash actionscript snippets when i suddenly found this on a very unknown edu page. lol
BUT I must say it is useful when u don't have a calculator

[tomiko]

haha...first time seeing this. cool to know lol.