(EPUB) [Secrets of Mental Math The Mathemagician's Guide to Lightning Calculation and Amazing Math Tricks]

  • ebook
  • 271
  • Secrets of Mental Math The Mathemagician's Guide to Lightning Calculation and Amazing Math Tricks
  • Arthur T. Benjamin
  • en
  • 25 November 2020
  • 9780285640665

Arthur T. Benjamin ´ 9 summary

Secrets of Mental Math The Mathemagician's Guide to Lightning Calculation and Amazing Math Tricks free read Ç 9 Learn maths secrets for the real world from shopping to calculating a restaurant tip and figuring out gambling odds or how much you've won Learn how to solve sudoku fast. Special thanks to NATALYA ST CLAIR for typesetting the initial draft which was partly supported by a grant from the Mellon Foundation D

review Secrets of Mental Math The Mathemagician's Guide to Lightning Calculation and Amazing Math TricksSecrets of Mental Math The Mathemagician's Guide to Lightning Calculation and Amazing Math Tricks

Secrets of Mental Math The Mathemagician's Guide to Lightning Calculation and Amazing Math Tricks free read Ç 9 Are a three digit number in seconds Learn how to perform lightning calculations in your head discover methods of incredible memorisation and other feats of mental agility. I slowed down about half way through this book and was ready to give it 3 stars In some cases I had discovered a fair number of the tricks on my own or had learned them elsewhere The processes described were sometimes just brute mathematics reuiring you compute then hold numbers in your head and compute again However the second half had some cool techniues that I didn t know and while 4 or 5 digit multiplication problems are just plain difficult as the author admits 3 and 4 digit suares are doable than I would ve thought and perfect cube roots of numbers with up to 6 digits are so easy it s fun With the neat mathematical magic tricks at the end to cap it off this book was back up to 4 stars for me

review Ö E-book, or Kindle E-pub ´ Arthur T. Benjamin

Secrets of Mental Math The Mathemagician's Guide to Lightning Calculation and Amazing Math Tricks free read Ç 9 How to calculate almost anything in your head Did you know that it's easier to add and subtract from left to right rather than the other way round You can be taught to su. This book helped me to re build a fresh perspective on doing math in my head He builds on a central idea of breaking down seemingly complex computations into simple manageable ones He then gives you new ways of seeing numbers such that once these various patterns become familiar you are able to employ tricks to getting the math done uickly One of his first examples is how to suare a two digit number that ends in 5 you need to remember only two things 1 The answer begins by multiplying the first digit by the next higher digit 2 The answer ends in 25 For example to suare the number 35 we simply multiply the first digit 3 by the next higher digit 4 then attach 25 Since 3 4 12 the answer is 1225 Therefore 35 35 1225