Mathematical Carnival

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• tzs · Dec 6, 2014 · Mentions

  …other well known methods (I forget which one) adjusted to make mental calculation easier. Addendum: this is described in chapter 7, "Tricks of Lightning Calculators" from the Martin Gardner collection "Mathematical Carnival".

  on “A Formula for the Number of Days in Each Month” ↗
• JoeDaDude · Jan 20, 2022 · Mentions

  …saver back in the day from instructions provided in a Scientific American article, which if memory serves was written by Martin Gardner. A casual search leads me to believe the article is in his book Mathematical Carnival, though I could be wrong. https://www.amazon.com/Mathematical-Carnival-Martin-Gardner/... While you program it up, you can play this little Hypercube game. Do it in 3D, then turn on the 4D to get an…

  on “Geometry from Another Universe” ↗