One day one of my friand solved a equation like 322 x 438/748 x 543 [its an example] with such method that he solved it within 2 minutes without calculator i was in real shock because when i tried it took over 20 minutes to solve it . I asked him to teach me the same method but he refused then i decided to take help of internet but was not able to do that because i didnt know what this method is called please help me i am waiting for your reply. My email is shahabk49@gmail.com please tell me whether if u know about this method or not please tell me.