Can you multiply 35 by 115 in your head? Learn this neat math trick of how to multiply two numbers that end in the digit 5. You can use it to estimate many other problems. The video also contains a proof of why the method works.

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Kyle
Alberto Nishikawa

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My Books

"The Joy of Game Theory" shows how you can use math to out-think your competition. (rated 4/5 stars on 23 reviews) [ Ссылка ]

"The Irrationality Illusion: How To Make Smart Decisions And Overcome Bias" is a handbook that explains the many ways we are biased about decision-making and offers techniques to make smart decisions. (rated 5/5 stars on 1 review) [ Ссылка ]

"Math Puzzles Volume 1" features classic brain teasers and riddles with complete solutions for problems in counting, geometry, probability, and game theory. Volume 1 is rated 4.5/5 stars on 11 reviews. [ Ссылка ]

"Math Puzzles Volume 2" is a sequel book with more great problems. [ Ссылка ]

"Math Puzzles Volume 3" is the third in the series. [ Ссылка ]

"40 Paradoxes in Logic, Probability, and Game Theory" contains thought-provoking and counter-intuitive results. (rated 4.9/5 stars on 7 reviews) [ Ссылка ]

"The Best Mental Math Tricks" teaches how you can look like a math genius by solving problems in your head (rated 4.7/5 stars on 3 reviews) [ Ссылка ]

"Multiply Numbers By Drawing Lines" This book is a reference guide for my video that has over 1 million views on a geometric method to multiply numbers. (rated 5/5 stars on 1 review) [ Ссылка ]

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