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Title: Secrets of Mental Math: The Mathemagician's Guide to Lightning Calculation and Amazing Math Tricks
ISBN: 0307338401
Author:
Arthur Benjamin
Michael Shermer
Publicate Date: 2006-08-08
Publish: 2006-08-08
List Price: $12.95
Average Customer Rating: 5.0
Format: Paperback
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Amazon Lowest New Price: $7.29
Amazon Lowest Used Price: $7.14
Amazon Merchant Price: $10.36
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| Customer Review: |
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1: Nice book.
Nice book. My son and I are both enjoying it a lot. I hope it sticks, I surely need it.
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2: Gold
this is practical, efficient arithmetic. if you take the time to master Dr. Benjamin's left -> right method for addition, subtraction and multiplication then while someone else is digging out their calculator, opening it, turning it on, and entering the problem (maybe incorrectly) you've already checked the answer in your head and moved on.
the division simplification and square root estimation (uncannily accurate) methods are also excellent.
one thing could be better. his treatment of mod sum checking falls short. if you reduce down to 1 digit as you go and ignore all 9's both in number and in all interim sums, then mod sum checking gets slick fast and it's easier to add that function to your mental calculator. also he doesn't mention mod sum checking of division. you can do it, but not by dividing.
modsum (quotient) X modsum (divisor) = modsum (dividend - remainder)
before i found this book, i spent alot of time with the Trachtenberg method. i just couldn't see what all the fuss was about. it seemed hoakey to me. now i know why. compared to this, it IS hoakey.
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3: Amazing Book!!!
I've never been good at math, but a couple years ago, I began to love Calculus and ended up taking Calc 1, 2 & 3. However, the only thing that was slowing me down was the simple arithmetic and mental calculations that I was so bad at doing. A friend recommended this book to me after I told her that my slow mental math was the reason I kept running out of time on the MCAT Physical Sciences section. I got this book two weeks ago and I've already increased my MCAT score by two whole points. This book is amazing and can really change your life. Do yourself a favor and buy it.
Thanks Dr. Benjamin!
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4: Secrets of Mental Math
This is a great book with lots of helpful hints at how to do mental math. My daughter wanted the book, and she is learning the material quickly.
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5: Excellent book
I am not a big fan of math but I thought I give it a try. Since I have the book, I am practicing on frequent bases and the tricks really work. Beside many hours of calculation practice the book also provides some nice stories about different lightning calculators.
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