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| #346440 in Books | 2015-01-31 | Original language:English | 9.00 x.37 x6.00l, | File type: PDF | 164 pages||0 of 0 people found the following review helpful.| Love This Book!|By Sophia B.|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.|0 of 1 people found the following|About the Author|Presh Talwalkar studied Economics and Mathematics at Stanford University. His site Mind Your Decisions has blog posts and original videos about math that have been viewed millions of times.
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 cal...
You easily download any file type for your device.The Best Mental Math Tricks | Presh Talwalkar. I really enjoyed this book and have already told so many people about it!
