02287cam a22003253u 450000100060000000300070000600500170001300600020003000700050003200800410003704000110007804100170008905000070010610000140011324500410012726400510016830000470021933600260026633700260029233800360031849000600035450000310041450802040044552011230064953400450177265300220181783000600183985600430189999900190194265078UtSlPG20260610134513.0mcr n260607r2021||||utu|||||o|||||||||||||| d  aUtSlPG 7aen2iso639-1 4aQA1 aAnonymous10aHow to become a lightning calculator 1aSalt Lake City, UT :bProject Gutenberg,c2021  a1 online resource :bmultiple file formats  atextbtxt2rdacontent  acomputerbc2rdamedia  aonline resourcebcr2rdacarrier1 aMultum in Parvo Library, Vol. I, No. 2, February, 1894.  aRelease date is 2021-04-13  aDemian Katz, Craig Kirkwood, and the Online Distributed Proofreading Team at https://www.pgdp.net (Images courtesy of the Digital Library@Villanova University (http://digital.library.villanova.edu/))  a"How to Become a Lightning Calculator" by Anonymous is a practical guidebook on quick and efficient calculations, likely written in the late 19th century. As a mathematical manual, it focuses on techniques, shortcuts, and methods to enhance mental arithmetic skills, making it a valuable resource for students, professionals, or anyone interested in improving their numerical proficiency.  The book offers a diverse range of strategies for addition, subtraction, multiplication, and division, all aimed at increasing speed and accuracy in calculations. It discusses methods for adding numbers quickly, including how to handle repeating figures and adding columns simultaneously. Additionally, the text covers multiplying numbers by specific values, calculating interest, making change, and understanding discounts, along with various tips and examples to aid comprehension. Ultimately, the book serves as a concise tool for mastering mental arithmetic, empowering readers with techniques to perform calculations with astonishing rapidity, akin to a "lightning calculator." (This is an automatically generated summary.)  nOriginal publication data not identified  aMental arithmetic 0aMultum in Parvo Library, Vol. I, No. 2, February, 1894.40uhttps://www.gutenberg.org/ebooks/65078  c105901d105901