Do you want to double or triple the speed with which you calculate? How to Calculate Quickly is a tried and true method for helping you in the mathematics of daily life -- addition, subtraction,... This description may be from another edition of this product.
Amazing what you can do quickly with your fingers.
Published by bernie4444 , 1 year ago
I found the techniques quite handy, and just explaining them to people would amaze them. We learn about number sense.
I had to learn most of this outside of school and was amazed to find many other people who think this way. Horizontal addition, left-to-right multiplication and division, etc., using a Comptometer left-to-right is natural.
You do need to do a little practice, so you look efficient when the need arises in the real world.
From the book:
Arithmetic is a science, but calculation is an art. Science is knowledge – art is a skill.
EXCELLENT BOOK TO IMPROVE MENTAL CALCULATION
Published by Thriftbooks.com User , 26 years ago
I gave it a five star simply because the books is simple and very effective at getting you to learn the "art" of quick calculation.I looked at all the others in that field. Most of them teach you tricks for quick calculation. To do certain calculation you need to remember the tricks. There are dozen of them and you just get confused. This book do not used trick but teach you "number sense" ... and how to calculate from left to right with complex number. Beleive me, I was affraid of that kind of calculation and with that book I learned a lot!I used it because I am preparing for interviews in management consulting. Case study need you to do lots of quick mental calculation. I am very good with complex calculation but mental arithmetics is something else.BUY THIS BOOK ... very slim, but as said before, lots lots of exercise well made and improving in difficulty ... cant say more, its the book I was looking for.Amusing, it was first published in 1945 ...
I have kept my copy for years
Published by Thriftbooks.com User , 26 years ago
and keep going back to it. It is important that a prospective buyer knows this book focuses on MENTAL arithmetic, i.e., no paper. If that is an interest of yours, then this is your book. If you are interested in "shortcuts", there are other books out there (though the last chapter of this book contains some of the more popular ones.) Don't think you can multiply two two-digit numbers in your head? you may be surprised.
It does what it says...
Published by Thriftbooks.com User , 26 years ago
Long collection of exercises to improve your mental calculating ability. This book will keep you busy for quite a while. It's slim but there's a lot of exercises in it. It will give you eough familiarity with numbers to do fairly large multiplication and division (let alone addition and subtraction) in your head. Fractions included. Requires no advanced math skills of any sort. Presupposes a knowledge of basic caluculation, that's it. No algebra, geometry etc.
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