25 People in a Square Grid Puzzle (VIDEO!)

Twenty-five people stand in a square 5×5 grid, one person per cell. At the blow of a whistle each person is to take a single step, horizontally or vertically and move into a neighboring cell to all end up as a new configuration of 25 people standing in a 5×5 grid, one person per cell. Can it be done?

This little video gives away the answer, so perhaps try playing with this first before watching!

Twenty-Five People Puzzle

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  Written for educators - and their students too! - this website, slowly growing, takes all the content Tanton has developed in his books, videos, and workshops, and organizes it into short, self-contained, and complete, curriculum units proving that mathematics, at all points of the school curriculum, can be joyous, fresh, innovative, rich, deep-thinking, and devoid of any rote doing! Let's teach generations of students to be self-reliant thinkers, willing to flail and to use their common sense to "nut their way" through challenges, to assess and judge results, and to adjust actions to find success. (Great life skills!)

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• Books

  • Thinking Mathematics! (TEN VOLUMES)
  • Solve This: Mathematical Activities for Students and Clubs
  • Encyclopedia of Mathematics
  • Geometry I & II

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  Email: tanton.math@gmail.com