calculation

2 articles · All tags

• Logarithms Explained: How the Slide Rule Multiplies by Adding
  A logarithm is the power a fixed base must be raised to in order to give a number, and that rule let the slide rule turn multiplication into addition.
• The Abacus and Mental Calculation
  How the abacus works, why bead arithmetic outperforms electronic calculators for trained users on speed, and what it reveals about the human number sense.