Children, who had repeatedly failed in arithmetic until their parents sent them to learn this method, were able to perform amazing calculations within seconds. This method would also work for say 12534553296837295x78.The Trachtenberg Speed System of Basic Mathematics is a revolutionary system for calculating and teaching basic math. It takes a shitload of practice to get so familiar with the system, but if you really want to excel at speed maths, its a great book. But if you know your 1-12 times tables to the point where its not something you think about, you just see the answer and you know this method extremely thoroughly, you can work out a question like this quicker than the traditional method. (6x8) + (2x3) + 3 = 57 so 3rd digit is 7 (carry 5)įor some sums this is a little slow. Try the Trachtenberg System for Speed Mathematics (a book).Ģx8 = 16 + 4x3 = 12 + 3 (carried forward) = 31 so second digit is 1 (carry 3) Is there any tricks out there that helps you with more digits multiplication? or is he doing it this fast w pure mental power? Anyway I am pretty impressed. I can do 3 digit multiplication in my head fairly quickly, but definitely not 5 digits. Being a good trading is about intelligence, strategy, controlling your emotions and luck etc.īut anyway, That guy is good, if the show is not staged. It doesn't mean you will be a good trader. GekkotheGreat:Mental maths show your mental agility. To begin preparing for your interview, WSO Prop Trading has everything you need to know for prop trading interviews, including a myriad of questions with thoroughly explained answers. Mental Math Practice for Consulting Case Interviews.If you're looking to prepare for your interview, JobTestPrep has everything you need to know for Mathematical Reasoning Test interviews, including a myriad of questions with thoroughly explained answers. I actually made myself an excel sheet that would spit out random numbers and would practice for ten minutes per day until I could do it like second nature. I have always been much more verbal then quantitative (ie standardized test scores, etc) so as lame as it sounds I actually had to practice to be able to really add and subtract numbers such as the above example quickly in my head. Bondarb - Hedge Fund Partner:I trade mostly fixed income and I find it is helpful, but not necessary, to be able to quickly add and subtract numbers with two decimals in my head quickly (like 252.86-135.37) but other then that i have never felt the need to do any higher level mental math.
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