Download PDF The Best Mental Math Tricks, by Presh Talwalkar
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The Best Mental Math Tricks, by Presh Talwalkar
Download PDF The Best Mental Math Tricks, by Presh Talwalkar
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Can you multiply 35x35 in your head? That is, can you square the number 35?
There's a mental math trick so that you can easily square any number ending in 5. Here's how the trick works.
Look at the first digit of 35, which is the number 3. We add one to that number, 4, and then multiply those two numbers together. So we have 3x4 = 12, and these are the leading digits of the answer.
Now we just write 25 as the last two digits, so we get 1225. And that's it! We have calculated 35 squared is 1,225 in an amazingly simple way!
Math does not have to be hard. The Best Mental Math Tricks is a collection of methods that can help you become a lightning calculator and look like a genius. You will learn how to solve daily problems like calculating percentages and figuring out which day your birthday is every year. Then you will learn how to square numbers, multiply numbers, divide numbers, and even solve complex problems like calculating the cube root of numbers in your head!
Each method is explained in detail with numerous examples. Every method is mathematically justified with a formal proof. Each section also contains practice problems accompanied with complete solutions so you can try the method and check your work.
- Sales Rank: #211472 in eBooks
- Published on: 2015-02-23
- Released on: 2015-02-23
- Format: Kindle eBook
About the Author
Presh Talwalkar runs the YouTube channel and blog Mind Your Decisions, which features videos and articles in math and game theory that have been viewed millions of times. He studied Economics and Mathematics at Stanford University.
Most helpful customer reviews
2 of 3 people found the following review helpful.
not only mental math tricks, but their explanations too!
By Maurizio Codogno
Have you ever looked at people seemingly able to perform arithmetical operations quicklier than your digiting the numbers on your pocket computer? Would you like to perform similar stunts? Then, this book is for you!
Some numeric feats depend on rote learning a lot of data, but other ones are much easier to perform with just a little training: Presh Talwalkar presents a lot of them, all of which are manageable for an average person. I particularly liked the multiplication of two numbers near 200, 300, ... and the division by 19. The nice thing is that *every* trick is presented with its mathematical explanation, so that the mistery of magic vanishes... but only for the initiati!
0 of 0 people found the following review helpful.
Overall very good
By Amazon Customer
Many useful tips with examples and practice problems. Also has proofs for those inclined to delve further into the mathematics. The memorization for some tricks may outweigh their usefulness but for many others it's a reasonable trade-off. Overall, very good.
0 of 1 people found the following review helpful.
Five Stars
By Raf van de Vreugde
If you like to show off with some nice math knowledge, this book is a good start!
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