This evening when I started arranging all the back dated news papers, I also read them and when I went through a amazing section of that particular newspaper, I found really a amazing article which says that some of the tribes residing in Ethiopian were multiplying two numbers by using the technique of doubling and halving the numbers. The technique is described below…
Now suppose you want to multiply numbers 15 and 13? How much is it that? This will be easy for you to solve, but here is the trick how tribesman would do this multiplication?
Put 13 in a left column and 15 on the right column. Halve the left figure; you get 6 ½. Ethiopians would ignore the ½ as they don’t know anything about fractions. Now double the right hand figure. Keep this until the left hand figure is 1. So till now your table would be…
Even numbers in the left column are evil, according do the belief of the superstitious tribesman and must be destroyed together with their guilty partners. So remove out the 6 and its partner 30. So now your table would be……
Now add all the numbers in right hand column and you have the right: 195.
So ready and got the new idea, then please try it with any of the two numbers you would be getting the right answer always. Don’t believe try with any other number.