How to become a Lightning Calculator by Anonymous is part of the HackerNoon Books Series. You can jump to any chapter in this book . Proof of Multiplication in Ten Seconds. here Proof of Multiplication in Ten Seconds. The of a number is the sum of its digits reduced to a unit. unitate The of the multiplier is 9 and the of the multiplicand is 6; 6 times 9 equals 54, and the of 54 is 9. Now the of the product is found to be 9 also, which is a proof of the correctness of the work. unitate unitate unitate unitate About HackerNoon Book Series: We bring you the most important technical, scientific, and insightful public domain books. This book is part of the public domain. Anonymous (2021). How to become a lightning calculator. Urbana, Illinois: Project Gutenberg. Retrieved https://www.gutenberg.org/cache/epub/65078/pg65078-images.html This eBook is for the use of anyone anywhere at no cost and with almost no restrictions whatsoever. You may copy it, give it away or re-use it under the terms of the Project Gutenberg License included with this eBook or online at , located at . www.gutenberg.org https://www.gutenberg.org/policy/license.html

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