The Best Mental Math Tricks by Presh Talwalkar
Requirements: .ePUB reader, 196 KB
Overview: Can you multiply 35×35 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 3×4 = 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. 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!
Genre: Non-Fiction > Educational
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