EBOOK or PDF Secrets 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

Arthur T. Benjamin ✓ 1 REVIEW

This book helped me to re build a fresh erspective 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 atterns He then gives you new ways of seeing numbers such that once these various atterns 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 multiplying the first 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 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 Gläsern 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 multiplicationroblems are just Detention of Doom plain difficult as the author admits 3 and 4 digit suares are doable than I would ve thought anderfect cube roots of numbers with up to 6 digits are so easy it s fun With the neat mathematical magic Tricks At The End at the end cap it off this book was back up to 4 stars for me Special thanks to NATALYA ST CLAIR for typesetting the initial draft which was Fromentin partly supported by a grant from the Mellon Foundation D I LOVE this book It s a nerd s dream come true for me I checked it out from the library and had it for at least two months Itained me to give it back I m going to buy it soon as I get money These tricks are so wonderful it s a wonder they didn t use these in school I loved the Pi Punishing My Slutty Little Sister part I can recite Pi to a hundred digits now Always been a goal of mine too I was content with knowing it for 20 digits but this made it super easy to know it to a hundred Then the figuring out the weekday when you have a date Awesome The multiplying is really neat too As you can tell I just LOVE this book I m cheesing writing this lol Go read it If you only read oneart I suggest the Pi bit As a nerd who is desperate for attention but also very lazy this book was a godsend Arthur Benjamin s mental math tips are very easy to learn yet still appear impressive to the casual observer Towards the end of the book there are some real showstoppers but even if one only gets halfway through the tricks you could still impress Blood+: Russian Rose, Volume 2 people at aarty a very lame arty The author is enthusiastic. 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. ,
But somehow this enthusiasm doesn t transmit to reader The tricks work but I am incredibly bored by this book regardless might have worked better with real life examples but I for one am hard ressed to think of a good real life reason to multiply a air of two digit numbers in your head Some years ago on a whim I icked up Moonwalking with Einstein by Joshua Foer In that book the author a hitherto unremarkable journalist details how he learned memory techniues that allowed him to recall hundreds of digits of i to learn the names of dozens of strangers in minutes and to memorize the order of an entire deck of cards in the amount of time it takes me to tie my shoes I was completely captivated The idea that someone could so radically augment his mental The Taste of Her Blood (A Lesbian Vampire Tale) prowess using ancient techniues appealed deeply to me Soon I set about teaching myself some of these methods The most famous andowerful is the so called memory alace converting information into images and then lacing these images in a familiar space Using this method I was able to memorize well over one hundred digits of i I even managed to learn the order of a few decks of cardsThis was impressive in itself and a testament to the efficacy of these techniues Even so learning the techniues was itself time consuming and without significant ractice I was sluggish both in committing to memory and recalling information You cannot become a memory athlete without significant ractice What was worse these systems only really worked with certain types of information The techniue for memorizing cards for example was useless when it came to remembering German vocabulary So after a few weeks I gave it upI bought this book during my brief memory trick craze but my enthusiasm had worn off before I began it Thus it languished on my shelves for many years until nowThough this book is technically co authored it seems obvious that Arthur Benjamin was the driving force behind it Michael Shermer the founder of the Skeptics Society contributed an afterword in which he argues unpersuasively that these mathematical tricks and techniues somehow aid in Being Skeptical Though A Uick Calculating Conspiracy Theorist Strikes Me skeptical though a uick calculating conspiracy theorist strikes me erfectly Who Is Gloria Steinem? plausible Benjamin meanwhile contributes the real meat of the book ways to speed up mental calculation He himself is a master of these techniues which he uses for a sort of numerical magic show there are many clips onlineBenjamin has done a wonderful job in compiling this little handbook The mathematical tools are simple easy to use and effective I had become so reliant on the calculator in myhone that it was a relief and if yo. Are a three digit number in seconds Learn how to erform lightning calculations in your head discover methods of incredible memorisation and other feats of mental agility.
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U can believe it a real leasure to return to
DOING SUMS AND PRODUCTS MYSELF THE 
sums and roducts myself The of numbers can be unexpectedly fascinating revealing unusual atterns connections and symmetries I must admit however that I mostly skipped the last section on large multiplication roblems since the amount of ractice reuired to roperly execute them exceeded my interest in being a human calculatorBenjamin s feats in calculation like Foer s feats In Memorization Show What The Simple Human Brain Can Do memorization show what the simple human brain can do aided with techniues and training achieving abilities so uncanny that it can seen like magic to the uninitiated To me this fact alone is cause for hopefulness since it reveals to us the transformative ower of expertise Foreword by Bill NyeBILL NYEWatching him was definitely the greatest time I had in science class Knowing that he advocates this book or was bought out to support it is Napříč nekonečnem pretty much worthy of my attentionNo uestion there is definitely useful to theoint of being necessary information in this book In the first chapter ironically Chapter 0 I was introduced to a smorgasbord of various tricks that became immediately useful the rule of multiplying 11s suaring numbers that end in 5 multiplying two digit numbers with the same first digit and second digits that sum to 10 which I admit was a little bit harder to have explained but as soon as I got it it became ridiculously valuable Two stars really isn t a fair rating Had some fun adding and subtracting and then multiplying 3 digit numbers in my head But as the roblems get complex my limitations became apparent Couldn t read through the entire book When I couldn t do what the book was suggesting just gave upSo no reading this book wont suddenly make you a math geniusThere are some interesting stories with interesting erspectives but not enough to inspire th Fantastic book If you love math or would just like to be able to struggle less with it this book is a great tool One caveat however don t expect magically easy math abilities Benjamin shows you the tools to make mental math roblems exponentially easier but at the end of the day you still need to calculate Now with that out of the way can you calculate suares and suare roots in you still need to calculate Now with that out of the way can you calculate suares and suare roots in head For two three no five digit numbers This book will show you the ways of these and many other fantastic mathematical restidigitation techniues Calculate the day of the week of any calendar date Check Estimate suare roots to many decimal laces Check Memorize Pi to hundreds of digits Check Use mod sums to check your answers Check digit Bottom line get this book if you want to nerd out and work your math muscles. 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. ,

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