How to Become a Lightning Calculator

by Anonymous

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Copyright Status: Manuscript of this book is available in public domain and copyright already expired.

How to Become a Lightning Calculator by Anonymous author.

  • Instantaneous Addition.
  • How to Add Two Columns at Once.
  • Multiplication.
  • Accurate Interest.
  • Equation of Payments.
  • The Lightning Calculator’s Addition.
  • Bank Discount.
  • How to Make Change.
  • Proof of Multiplication in Ten Seconds.
  • The Canadian Interest Rule.
  • Table of Transposed Numbers.
  • Short Method to Find the Interest of a Given Sum.
  • Interest Computations.