The Best Mental Math Tricks
Product ID: 26863914
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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. Review: Loved it - The format is extremely clear. The author provides procedures, examples, and practice problems for each math trick. There are even proofs on why these methods worked. I found the practice problems fun because the methods were so quick and simple. This is really something I look forward to using during my life as a student. Review: Love This Book! - I'm in 6th grade, and I watch Presh Talwalkar's YouTube channel, Mind Your Decisions. I really needed some tricks to memorize all the stuff I was learning, and here it was! It had many tricks to learn, from squaring any number ending in five to easily finding percents. I just love it and would totally buy it again.
| Best Sellers Rank | #1,132,786 in Books ( See Top 100 in Books ) #478 in Popular & Elementary Arithmetic (Books) #818 in Math Games |
| Customer Reviews | 4.4 out of 5 stars 155 Reviews |
G**V
Loved it
The format is extremely clear. The author provides procedures, examples, and practice problems for each math trick. There are even proofs on why these methods worked. I found the practice problems fun because the methods were so quick and simple. This is really something I look forward to using during my life as a student.
S**.
Love This Book!
I'm in 6th grade, and I watch Presh Talwalkar's YouTube channel, Mind Your Decisions. I really needed some tricks to memorize all the stuff I was learning, and here it was! It had many tricks to learn, from squaring any number ending in five to easily finding percents. I just love it and would totally buy it again.
B**A
Learned Math Functions To Make Easy Calculations
Have learned new techniques and methods to for solving mathematical problems. What I have learned and practicing is fun and educational. Shared some techniques with a third grade teacher and she was excited to learn some of these methods.
A**.
Filled with excellent "tricks" for mental math
A well written book. Contains all the mental math techniques I have used throughout my life, and MANY more. I think it's fun to read and practice. Looking forward to reading more for this author.
R**E
Five Stars
If you like to show off with some nice math knowledge, this book is a good start!
A**R
Five Stars
nice
M**O
not only mental math tricks, but their explanations too!
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!
J**O
Not that impressed
Save your money.
D**N
Good tricks
The book has good mental math tricks, though you will obviously need to practice to remember them. The style is simple.
C**E
Como professor e estudante de matemática eu super recomendo. É quase uma obrigação ler e reler esta preciosidade.
Super recomendo a todos que querem ver a matemática de forma encantadora e que procure uma forma de se tornar muito mais ágil.
J**.
Great book
Easy to understand. Will greatly improve your mental arithmetic.
A**O
Di facile lettura, con molti esempi.
Rispetto a libri simili letti in precedenza lo ho trovato più completo e di facile lettura con paragrafi corti e con molti esempi per ogni trick.
E**T
Five Stars
Brilliant book especially as I love algebra
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