Think Like A Maths Genius: The Art of Calculating in Your Head

This is comparable to the Tractenberg Speed systems of maths which is taught in Switzerland. Both books use different techniques, good for children and adults to have a choice.

Libro molto interessante che dà risultati rapidi! È abbastanza piccolo da poter essere trasportato ovunque e lo spessore della carta è di qualità.

Writer/genius is very famous for his brain powers. His techniques are very helpful to increase brain capacity to a maximum level.I have already seen the improvement of my calculations and use it every day.

This is a great book to re-learn practical arithmetic and use your head instead of becoming dependent on your calculator or cell phone. Run through the book to understand what it is trying to tell you, then go back and apply the lessons, and with a little practice; you will kick yourself for not learning this year earlier.

As described.