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Speed Mathematics: Secret Skills for Quick Calculation, by Bill Handley
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Using this book will improve your understanding of math and have you performing like a genius!
People who excel at mathematics use better strategies than the rest of us; they are not necessarily more intelligent.
Speed Mathematics teaches simple methods that will enable you to make lightning calculations in your head-including multiplication, division, addition, and subtraction, as well as working with fractions, squaring numbers, and extracting square and cube roots. Here's just one example of this revolutionary approach to basic mathematics:
96 x 97 =
Subtract each number from 100.
96 x 97 =
4 3
Subtract diagonally. Either 96--3 or 97-- 4.
The result is the first part of the answer.
96 x 97 = 93
4 3
Multiply the numbers in the circles. 4 x 3 = 12.
This is the second part of the answer.
96 x 97 = 9312
4 3
It's that easy!
- Sales Rank: #957855 in Books
- Published on: 2003-10-20
- Original language: English
- Number of items: 1
- Dimensions: 9.00" h x .75" w x 6.00" l, .73 pounds
- Binding: Paperback
- 272 pages
From the Back Cover
Using this book will improve your understanding of math and have you performing like a genius!
People who excel at mathematics use better strategies than the rest of us; they are not necessarily more intelligent.
Speed Mathematics teaches simple methods that will enable you to make lightning calculations in your head–including multiplication, division, addition, and subtraction, as well as working with fractions, squaring numbers, and extracting square and cube roots. Here’s just one example of this revolutionary approach to basic mathematics:
96 x 97 =
Subtract each number from 100.
96 x 97 =
4 3
Subtract diagonally. Either 96—3 or 97— 4.
The result is the first part of the answer.
96 x 97 = 93
4 3
Multiply the numbers in the circles. 4 x 3 = 12.
This is the second part of the answer.
96 x 97 = 9312
4 3
It’s that easy!
About the Author
BILL HANDLEY is recognized as an authority on teaching and study methods. His methods of teaching mathematics and his strategies for learning and thinking have achieved astonishing results in schools worldwide.
Most helpful customer reviews
69 of 75 people found the following review helpful.
A LONG COMPLICATED REVIEW
By William M.
The classic book on high speed calculation was written by Lester Meyers and titled HIGH SPEED MATH SELF-TAUGHT. I have two copies of the 1961 edition on my paperback shelf since I pick up a copy anytime I see one at a library sale. I got my first copy in sixth grade (true story). There are very few tricks that appear in ANY speed math book that don't also appear in Meyers book. But most of Meyers book is information on what to do in very specific problems (multiplying by 9, multiplying by 36, etc.) Nowadays, people generally want methods that are applicable in a wide variety of situations, not just multiplying by specific numbers.
A good test for one of these books is to see how it deals with division. Division is by far the most difficult operation for kids to learn, and books on speed math are often very short on division methods. Handley's book contains two methods, one of which, as far as I know, only appeared in A. H. Russell's RAPID CALCULATIONS (printed in London, 1956, hard to find.)
Why three stars? The book is very good in teaching what Handley calls the reference number method for multiplication. But I think the average reader would have difficulty following some of the explanations for both division methods. Handley's subtraction method (which he says he was taught in third grade) is excellent - recommended for any parent whose kids are having trouble borrowing. There are other interesting things here(meaning things I have not seen before or not seen in awhile)--an easy way to go from Fanrenheit to Celsius or vice versa, multiplying feet and inches by feet and inches, a quick method for mental square root estimates. But I am not sure the average reader will be able to follow all of Handley's explanations. So, next reviewer, whoever you are, please comment on how easy to follow you found the explanations to be. Maybe I am unnecessarily pessimistic. In any case, despite these reservations, the book is recommended.
12 of 13 people found the following review helpful.
The easiest techniques I've seen for mental math
By Rob Ryley
In my day job as an occupational therapist, I often have to work with individuals who, for whatever reason, have problems that impair their ability to solve problems, and cope with everyday life. Traditional methods of teaching arithmetic and problem solving, simply do not work for a significant percentage of people. This has lead me to look for alternatives.
In addition, I have always enjoyed reading about science, statistics, and the related areas, but discovered that without understanding higher mathematics, there is an invisible ceiling, where you won't be able to go beyond. I've made it a priority of mine to improve my mathematics abilities to the point I'll be able to apply to graduate school for training in statistics and/or economics.
Where does this book come in? After all, this isn't REALLY mathematics, but "mere" arithmetic. First, if you are math phobic it will boost your confidence. Within days, you will be able to multiply at least 2 digit numbers up to 100, very easily, in your head. You will be able to square a number like 625 within seconds, and get 390625. You will also learn methods for square roots.
It will get your brain to recognize patterns. If you are the least bit curious, you will wonder why these methods work. You will try to figure out a way to prove, to yourself, that these methods work. This recognition of number patterns, and their proofs, is essentially what algebra--that dreaded high school subject, is all about.
With your improvement in algebra, learning calculus is much easier. Once you figure out calculus, probability and statistics will
be much easier to understand. At that point, there will be no limit on what you can learn on your own.
When I'm studying a subject such as calculus, I will typically warm up by doing a few problems in mental math, from this book, to get in the right frame of mind. I notice that I pick up the material a bit faster when I do this. I've looked at Trachtenberg's very interesting work, but I don't find that I ENJOY using his methods (aside from his written long division method). There are simply too many, what appear to be ad hoc rules. Handley's method is more appealing.
If you are an adult who is preparing for some admission test (GRE, GMAT, etc.), I would recommend studying this book as it will give you an advantage on the quantitative section. This is true even if you use some other test prep, such as Kaplan or Princeton Review.
If you are the parent of a "learning disabled" child who has trouble with basic skills, try these methods out. You might find out that your "disabled" child is really a gifted student who hasn't been provided the environment in which to thrive.
13 of 15 people found the following review helpful.
Regarding 13*54
By jzs
First, a great book. I'm enjoying putting some of these methods to use!
Second, in response to Nehal from 4/7/05:
"But what happens when we want to multiply 13 x 54? In this case, we would like to start out with 10 (for 13) and 50 (for 54) giving us 10 x 50 = 500. In other words, we use 2 Reference Numbers: 10 and 50. Next, we make the corrections from here."
13*54
Use 10 as the reference number for both. Mentally write
+3 +44
over the 13 and 54 respectively.
Gives
54 + 3 = 57, and 57 * 10 = 570
so 570 +
44 * 3 = 120 + 12 = 132
so the answer to 13*54 = 570 + 100 + 32 = 670 + 30 + 2 = 702
Sure, problems in general get more difficult as you stray from the reference number, that's a given, but it is no big deal.
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