Saturday, September 15, 2012

multiplication of four digit numbers fast




Hi! In this post we are going to learnto multiply 4digit number in 5-10secs
Before that you need to mind these things…
1) in competition exams we need not to do whole multiplication  in order to find the result
2) if we found last two or three digits, it is enough to choose answer form given options

lets try the multiplication of 1234 &4321
 
please follow the figures given below
 


 



In this technique answer is going from right to left

red colored bold digit is digit found in each step
green colored digit
denotes the carry numbers to be added to next digit
mostly in the third step we will get the answer
hope this figures 1-7 make you clear how to find the digits of the product 1234 and 4321


hope this figures will make you clear how to use this technique




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