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Disappointing - to say the least
am 19. Dezember 2012
As seldom a case as this may be:
After reading this book, I ended up really annoyed, that I was "tricked" into thinking, that this might be a fun recreational math book to read in my precious spare time.
Without myself being a wizard of math, I can easily confirm that "Secrets of mental math" does not contain anything but very simplistic algebraic transformations, which are usually taught in 4.th to 6.th grade (perhaps up to 8.th grade iff your school is more into music and arts or languages). While reading, I always waited for the ingenious transformations to appear on the very next page, and up to the end I couldn't believe, that there are none, which an average educated person wouldn't employ anyway.
Half of the lonely star, I'm forced to give anyway, may however well be dedicated to quite a few little episodes on famous "mathmagicians" in history, who more often than not were very young children who acquired astonishing number crunching capabilities (which may very well serve as a hint to the complexity of this book).
The other half goes to the author himself, who judging by his book turns out to use nothing else than everyday transformations and simplifications and a few basic mind mapping techniques in order to achieve his astonishing accomplishments. Unfortunately writing of this book does not seem to be one of them.