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Secrets of Mental Math: The Mathemagician's Guide to Lightning Calculation and Amazing Math Tricks Paperback – August 8, 2006

by
Arthur Benjamin (Author)
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Arthur Benjamin (Author),
Michael Shermer (Author)
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Michael Shermer (Author)
4.5 out of 5 stars 322 customer reviews
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Product Details

  • Age Range: 8 and up
  • Paperback: 304 pages
  • Publisher: Three Rivers Press; 7.9.2006 edition (August 8, 2006)
  • Language: English
  • ISBN-10: 0307338401
  • ISBN-13: 978-0307338402
  • Product Dimensions: 5.2 x 0.6 x 8 inches
  • Shipping Weight: 8.5 ounces (View shipping rates and policies)
  • Average Customer Review: 4.5 out of 5 stars  See all reviews (322 customer reviews)
  • Amazon Best Sellers Rank: #5,895 in Books (See Top 100 in Books)

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Customer Reviews

Most Helpful Customer Reviews

619 of 643 people found the following review helpful
Beware of duplication
By Antoin O'Gealbhain on July 10, 2007
Format: Paperback
I bought a copy of Secrets of Mental Maths. As a trained scientist and a professional magician I was interested in the contents, and was not disappointed. Great stuff here for impressing people, and useful techniques for making maths fun. However the Amazon website offered two books togehter - this book and another by the same authors; Think Like A Maths Genius. I ordered both, and was shocked when they were delivered. The second book (Think Like A Maths Genius) was just Secrets of Mental Maths with a different cover. Amazon should have known both were the same book and should not have offered them both together. Don't be caught out by this. That aside, I highly recommend buying one or other version of this book.
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290 of 298 people found the following review helpful
Great for SAT/GRE study!
By Zach Foreman on September 25, 2007
Format: Paperback Verified Purchase
I am a professional SAT/GRE teacher and tutor, achieving an 800 in the GRE math section. After telling many students that the secret to the math section is mental math and approximation, I decided to see what books were available. I saw that this one had good reviews and ever since then I have been bringing the book to all my classes and tutoring sessions. I recommend this book for those who never felt they got the hang of math as well as people who love it like I do. It is clearly written, very encouraging and has lots of drills.
I love this book and I think that it really will help people feel more confident when they take a test or just are trying to figure the tip.
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258 of 277 people found the following review helpful
Right to the point, effective, and fun!
By Robert Potter on October 11, 2006
Format: Paperback
At first glance, this book could easily be overlooked and dismissed as another "just buy this book and follow my easy steps to becoming a (genius, millionaire, happier person, psychic, master gardener, whatever)" that would utimately leave you disappointed that you couldn't do it.

Well, this book is not that. It gets right to the point. It's very well written. It's fun. It's practical. And as long as you take your time to mentally practice what you're learning along the way, you can and should be able to master the techniques in this book. You needn't have any mathematical expertise going in. Of course, the author doesn't promise anything special about what you can do with these abilities, although there are some practical applications suggested along the way. All I can say is that it's fun and gives you something interesting to do with your brain when you're bored. And certainly if you like Math already or are a Math teacher, it can be tremendously helpful.

Arthur Benjamin wrote the main content of the book, and Michael Shermer (Skeptic Magazine founder and Scientific American columnist) wrote introductory and closing chapters. These seem a little out of place to me, but they're certainly very good and useful general information about critical thinking. In addition to Bill Nye's (The Science Guy) new intro, James Randi's (famous magician and skeptic) introduction from an earlier edition is included.
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132 of 148 people found the following review helpful
Good book, but watch out for the typos
By Fritillary Lil on December 13, 2009
Format: Kindle Edition Verified Purchase
I bought this book in its Kindle version for my PC. I am enjoying it, and happy to see progress in my ability to perform mental calculations. Math was never my strong suit, so this is just what I need.
My only negative comment is that the publisher needs to more carefully edit the text. I came upon three typos within the first couple of chapters, and these were errors in operations signs (for example, "+" instead of "x").
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23 of 23 people found the following review helpful
Tip: Use EXCEL to generate practice problems
By Daveen on May 14, 2012
Format: Kindle Edition
I like the book a lot. One of the big revelations is that it really makes more intuitive sense to do arithmetic from left to right rather than right to left as we're taught in elementary school, just like saying "a dollar ninety-five" makes a lot more sense than "5 and 90 and a dollar.".

Anyway, the main purpose of this "review" is to share my success at making a regenerating practice sheet in Excel that will generate an endless number of problems. If you like to tinker with Excel, go for it! But I'll give you mine if you want it. The core of mine is the random number generator "rand()" and I manipulate it with other functions. For example, the cell formula

"=VALUE(LEFT(TEXT(RAND()*100000,0),3))"

(without quotes) will place a three digit random whole number in a cell.

I've begun a spreadsheet of drills for the first few subjects in the book, including multiplying by 11, squaring two-digit numbers ending in five, finding compliments, adding and subtracting three-digit numbers, and multiplying 2 x 1 digits and 3 x 1 digits. For each of those types of problems there are ten examples. The answers are hidden (by using a white font) until you highlight the answer cell. The real beauty is that hitting F9 generates a whole new set of ten problems for each type. As I continue to read the book, I'll add more drills. When you have time to kill, it's a much more productive activity than Free Cell!

Leave a comment if you'd like me to email the spreadsheet to you. With the sample techniques I've used you can probably figure out how to make additional problem types.
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54 of 60 people found the following review helpful
Great Book But Kindle Version Needs Improvement
By Twiggy on October 13, 2010
Format: Paperback
I have bought a number of different books like this to find different ways to help my 14 year old who struggles with arithmetic and is falling behind in school as a consequence. I find this to be the best of them because it has all of the techniques found in other books in one place. The light hearted presentation is really great and the author really helps by suggesting ways to think e.g. How to talk in your head. More importantly, the techniques appeal to my kid and he is making progress.

My only beef is with the kindle edition. No hyperlinks between exercises and corresponding answers plus the examples are presented as images so they don't increase in size when you choose a different text size for reading. I think Kindle editions should take steps to exploit the different medium and not just replicate the hardcopy. You can zoom in on those images but it is cumbersome. If you don't absolutely need the ebook I recommend choosing the hardcopy version. On a positive note the kindle edition does not appear to be plagued with copious spelling errors like so many other titles.

Update: Despite the positive comment regarding the lack of spelling errors, there are still several typos in the kindle edition of the book that other reviewers have pointed out including the use the + symbol for addition when the multiplication symbol should have been used.
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