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Arithmetricks: 50 Easy Ways to Add, Subtract, Multiply, and Divide Without a Calculator Paperback – June 23, 1995
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From the Publisher
Demonstrates easy math tricks in an accessible and engaging manner that will appeal to children. In addition to the 50 tricks, the text includes a review of pertinent mathematical concepts, actual applications, math curiosities, illustrations and parlor tricks.
From the Back Cover
Become a mental-math master and astound your friends, family, and teachers with . . . Arithmetricks
"A fascinating and useful book. I recommend it."
Jaime Escalante (of Stand and Deliver fame) Hiram W. Johnson High School
"Arithmetricks will fascinate students of all ages. A resource 'must' for all math programs."
Howard Wang, Founding Director of Sierra Canyon College Preparatory School
"The tips and tricks were really cool."
Liz Matthews, age 12, Anacapa Middle School
Packed with 50 tricks and tips that let you add, subtract, multiply, and divide in a flash, Arithmetricks makes math easier and more fun than you've ever imagined. You won't need a calculator, or in many cases even a pencil, to come up with the correct answers. Just a few simple shortcuts will have you solving basic problems in record time.
Arithmetricks will not only amaze you, it will also help you at school and in your daily life. Most of all, you'll have plenty of fun along the way!
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Addition trick #21 - "Gliding Across the Ice" - teaches single-digit addition from left to right. I regularly had fifth and sixth graders who swore they couldn't do this begging me within fifteen minutes to give them longer and longer strings of addition to test them! Trick #23 extends the ability with 2-digit numbers, etc.
The first half of the book has methods that seem so obvious when you see them that you wonder why you weren't shown them in school. That's why whenever I get the opportunity, either when teaching, substitute teaching, or tutoring, to show some of these "tricks" to students.
Great for "sponge" activities, also, or for transition times when you need to do something for 5 minutes.
This book is the best one for training in that. I , after growing up, first had "Short-Cut Math" which is quite good, but this one does it one batter. I have 3 other books on the same subject, and this is the best of the five, althougn one which is quite cutesy might be a good starter for someone having a lot of trouble and needing some "mneumonic story aids".
This is formula manipulation, which in high school [ and even junior high now ] is called algebra. That't what's behind it all -- so kids that learn this have a leg-up on that field later on.
One other crucial fact for usage in "standardized testing" -- this is great for quickly "ball park estimating" the answers to multiple choice questions, which come up in word problems and chemistry in particular.