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Tetra Flexagon


  • Measure and divide the paper into fourths one direction and thirds the other way. Fold each line backward and forward a few times.
  • Number the front and back of the paper in pencil, lightly, as shown. Then carefully cut a center flap along the dotted lines.
  • Fold the paper along the dark lines as shown, so the center flap sticks out from underneath and the right-hand column shows all 2’s.
  • Fold the flap the rest of the way around to the front and fold the right-hand column under again. (Shown as dark lines on the diagram.) This makes the front of the flexagon show 1’s in every square.
  • Carefully, tape the flap to its neighbor on the folded column. Don’t let the tape stick to any but these two squares.
  • Gently erase your pencil marks. 
Picture
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