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Found in: mathematics, 3-5, 6-8, 9-12

Numberphile is a library of short videos on mathematical subjects. Teachers will find videos that can be used in grades 5-12. Numberphile is also on Youtube, Facebook, Twitter, and Flickr.

  • In Cake Cutting (5:09) Alex Bellos, author most recently of The Grapes of Math: How Life Reflects Numbers and Numbers Reflect Life, demonstrates a method of cutting a circular birthday cake so that exposed surfaces don’t become stale. Francis Galton first proposed the method in a letter to Nature (20 December 1906).
  • Soccer Ball (8:05) is an explanation of the Euler Characteristic and a demonstration of how the Euler Characteristic determines how many pentagons and hexagons are necessary for tiling a soccer ball. The video shows algebra used in problem solving.
  • In Mobius Bridges (5:58) examples of bridges and buildings fashioned from the Mobius band are featured. The video could be used as a kick off for a design project.
  • Infographic  (6:19) is a look at Charles Joseph Minard’s famous graphic of Napoleon’s disastrous march into Russia in 1812. This especially effective example could be used as a benchmark for judging others on the Internet.
  • In Pi and Rivers (6:27) students discover the relationship of Pi to the sinuosity, or the bendiness, of rivers. Numberphile has more Pi related videos ready for Pi Day.
  • Numberphile2 provides additional information for select videos.


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