How to Become a Lightning Calculator
by Anonymous
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Language: English
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About this eBook
- Author
- Anonymous
- Title
- How to become a lightning calculator
- Credits
- Demian Katz, Craig Kirkwood, and the Online Distributed Proofreading Team at www.pgdp.net (Images courtesy of the Digital Library@Villanova University ( digital.library.villanova.edu/))
- Language
- English
- LoC Class
- QA: Science: Mathematics
- Subject
- Mental arithmetic
- Category
- Text
- Project Gutenberg
- eBook-No. 65078
- Release Date
- April 13, 2021
- Copyright
- Public domain in the USA.
Contents
- 1.Untitled
- 2.How to Become a LIGHTNING CALCULATOR.
- 3.Instantaneous Addition.
- 4.How to Add Two Columns at Once.
- 5.Multiplication. — To Multiply Any Number by 11. — To Multiply by 101, 1001, etc. — To Multiply by 5, 25, 125. — Another Easy Way to Multiply. — To Subtract Any Number Consisting of Two Figures from 100. — Divisions. — Simple Discount Rule. — Percentage.
- 6.Accurate Interest.
- 7.Equation of Payments.
- 8.The Lightning Calculator’s Addition.
- 9.Bank Discount.
- 10.How to Make Change.
- 11.Proof of Multiplication in Ten Seconds.
- 12.The Canadian Interest Rule.
- 13.Table of Transposed Numbers. — Explanation of Foregoing Table.
- 14.Short Method to Find the Interest of a Given Sum.
- 15.Interest Computations.
- 16.Untitled
- 17.Transcriber’s Notes:
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