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Secrets of Mental Math: The Mathemagician's Guide to Lightning Calculation and Amazing Math Tricks |  | Authors: Arthur Benjamin, Michael Shermer
Publisher: Three Rivers Press
List Price: $12.95
Buy New: $7.32
as of 11/25/2009 01:10 CST details
You Save: $5.63 (43%)
New (35) Used (12) Collectible (1) from $7.25
Rating:  34 reviews
Sales Rank: 2255
Media: Paperback
Pages: 304
Number Of Items: 1
Shipping Weight (lbs): 0.4
Dimensions (in): 7.9 x 5.1 x 0.8
ISBN: 0307338401
Dewey Decimal Number: 510
EAN: 9780307338402
ASIN: 0307338401
Publication Date: August 8, 2006
Availability: Usually ships in 1-2 business days
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Product Description
These simple math secrets and tricks will forever change how you look at the world of numbers.
Secrets of Mental Math will have you thinking like a math genius in no time. Get ready to amaze your friends—and yourself—with incredible calculations you never thought you could master, as renowned “mathemagician” Arthur Benjamin shares his techniques for lightning-quick calculations and amazing number tricks. This book will teach you to do math in your head faster than you ever thought possible, dramatically improve your memory for numbers, and—maybe for the first time—make mathematics fun.
Yes, even you can learn to do seemingly complex equations in your head; all you need to learn are a few tricks. You’ll be able to quickly multiply and divide triple digits, compute with fractions, and determine squares, cubes, and roots without blinking an eye. No matter what your age or current math ability, Secrets of Mental Math will allow you to perform fantastic feats of the mind effortlessly. This is the math they never taught you in school.
Also available as an eBook
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| Customer Reviews:
Showing reviews 1-5 of 34
 Great stuff but must practice November 24, 2009
David J. Sawyer (NYC)
This book is awesome... it provides some great tricks but when it all comes down to it one most practice practice practice... that is the most important thing. I def recommended this book if you want to get faster but make sure to put in the time.
 Kindle Edition October 21, 2009
M. Buckman (USA)
I can't really add anything that the other good reviews haven't already mentioned, so I'll just say that the Kindle edition of the book is great. I own the printed edition and wanted the Kindle edition to make accessing this material more convenient. Since this book uses many tables, and I've seen some Kindle books that do not format tables correctly, I was hesitant to try this book since the sample did not include any of this material for me to check. However, I was pleased to see that all of the tables were formatted exactly as they are in the book. Since the tables appear to be entered as pictures rather than text, you cannot resize them, but that's not too big of a deal. The only complaint I have, and it is a minor one, is that the answers in the back are linked to the tables to which they correspond, but the tables are not linked to the answers. Otherwise, the Kindle edition is perfect.
 Tips on Doing Mental Math Calculations October 8, 2009
Eric Mayforth (Houston, Texas)
Being able to do math calculations in your head has many practical benefits, including calculating a tip in a restaurant, estimating time and distance when taking trips, and it comes in handy in many other situations as well.
This book by Arthur Benjamin and Michael Shermer is designed to improve your calculating skills. It teaches you how to add, subtract, and multiply from left to right, not right to left as we were taught in school. Performing these calculations in this way seems unnatural at first, but one can see the benefits of left-to-right calculation after working this way.
Tricks for squaring two-digit and three-digit numbers and cubing two-digit numbers are revealed, and the author shows you the algebra behind the tricks that demonstrates why they work.
Mnemonic procedures are required for the most daunting tasks introduced (squaring five-digit numbers and multiplying three-digit numbers by two-digit numbers). One would need a lot of motivation and a whole lot of practice to become proficient at calculating mentally the harder problems in the book.
Testing for divisibility, handling estimation problems, and figuring out the weekday for any date in the Gregorian calendar era are other topics that round out this volume.
Fun book, even for a 9 year old September 25, 2009
Marc Abrams (Illinois, USA)
This book was a pleasant surprise. I was able to pick up several "tricks" that make complex calculation quicker and easier to perform mentally. Definitely useful for day to day situations. My 9 year old was also able to learn some of the techniques shown.
Practical and life changing September 21, 2009
A human calculator
1 out of 1 found this review helpful
This book is very near and dear to my heart. I have always been horrible at anything having to do with numbers and numerical concepts. I was, in short, innumerate. I decided to do something about it and I felt that playing with numbers would be a way to better familiarize myself with their properties. I bought the book and started practing from the beginning. I was doing fine until I got to squaring two digit numbers. I just couldn't do it and I became obsessed. Everywhere I went I brought a calculator with me and mentally squared all two digit numbers I saw and checked my answers. Eventually I broke through, and subsequently actually memorized all the squares up to 150. Now I am up to squaring four and five digit numbers mentally.
The book and methods do work if you practice and go step by step mastering the various stages because it all builds on itself. There's nothing more satisfying, at least to me, than having this new mental facility with numbers that leaves other people amazed. The great thing is that these are not number specific shortcuts but a systematic approach to doing any type of calculation, so if, like me, you are able to go beyond the scope of the book you can apply the framework and principles to your new calculations. I highly recommend this book, I know when I have kids I will be teaching them arithmetic using this approach. Thanks to Dr. Benjamin, I am now a human calculator, and it is so much fun.
P.S In teh book Dr. Benjamin doesn't mention this but once you are able to square four digit numbers you are also able to raise two digit numbers to the fourth power. For example 68^4 is the same thing as 4,624 ^2 because 4,624 is 68^2 you are really squaring 68 twice. Just a little bonus I thought I'd throw in. Buy this book and throw away your calculators.
Showing reviews 1-5 of 34
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