Project Gutenberg 2021-04-13 Public domain in the USA. 289 Anonymous Anonyme Anonymous, Anonymous How to become a lightning calculator Multum in Parvo Library, Vol. I, No. 2, February, 1894. Demian 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/)) "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.) Reading ease score: 72.3 (7th grade). Fairly easy to read. en Mental arithmetic QA Text Category: Mathematics Category: How To ... 64305 2025-06-26T03:55:31.688978 text/html 39895 2024-10-18T13:08:45 text/html 90569 2025-06-26T03:55:34.766972 application/epub+zip 89624 2025-06-26T03:55:32.378970 application/epub+zip 89624 2025-06-26T03:55:32.030974 application/epub+zip 126828 2025-06-26T03:55:36.636944 application/x-mobipocket-ebook 109459 2025-06-26T03:55:34.417975 application/x-mobipocket-ebook 109534 2022-09-29T09:53:48.363843 application/x-mobipocket-ebook 37301 2025-06-26T03:55:31.457980 text/plain; charset=us-ascii 17341 2024-10-18T13:08:45 text/plain; charset=us-ascii 16187 2025-06-26T03:55:36.920969 application/rdf+xml 19437 2025-06-26T03:55:32.098989 image/jpeg 3286 2025-06-26T03:55:32.064982 image/jpeg 69574 2025-06-26T03:55:31.695980 application/octet-stream application/zip Archives containing the RDF files for *all* our books can be downloaded at https://book.klll.cc/wiki/Gutenberg:Feeds#The_Complete_Project_Gutenberg_Catalog en.wikipedia More titles under Unknown