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Five Triangles: 42. Hyperbola - 0 views

fivetriangles.blogspot.com/...42-hyperbola.html pedagogy problem solving
shared by Chris Harrow on 13 Dec 14 - No Cached
  • Chris Harrow on 13 Dec 14
     
    Read the 2 comments at the bottom of the post. Brilliant and spot-on 2nd comment.
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Origami 8 point star by Robert Neale - YouTube - 0 views

www.youtube.com/watch origami ninja star youtube
shared by Chris Harrow on 01 Dec 14 - No Cached
  • Chris Harrow on 01 Dec 14
     
    for 4-5 math club
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Styrofoam Cup Problem - 0 views

www.estimation180.com/styrofoamcups.html pedagogy technology videos
shared by bmalin on 14 Nov 14 - No Cached
  • bmalin on 14 Nov 14
     
    I'm at NCTM and a presenter used his video to present a lesson. Very cool stuff!
  • bmalin on 14 Nov 14
     
    The presenter was Eric Milou, here is his powerpoint http://tinyurl.com/NCTM14milou
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Cyclic fractions | John D. Cook - 1 views

www.johndcook.com/...cyclic-fractions fractions cyclic
shared by Chris Harrow on 13 Nov 14 - No Cached
  • Chris Harrow on 13 Nov 14
     
    Another math boundary...
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Magic Square -- from Wolfram MathWorld - 0 views

mathworld.wolfram.com/MagicSquare.html Proof uniqueness
shared by Chris Harrow on 12 Nov 14 - Cached
  • Chris Harrow on 12 Nov 14
     
    Number of unique magic squares. >There is (1) 1x1 square--duh. >Interesting that there are (0) 2x2 squares.  Place any number in any corner--both adjacent corners must be the same number, preventing a square.   Can a 5th grader follow this?  >There is (1) 3x3 square. Can be reasoned out by cases. Can 5th grader follow? >There are (880) unique 4x4 squares. Very interesting that this number jumps so quickly. >Stunning:  There are (275,305,224) unique 5x5 squares.  WOW! >>We don't know how many 6x6 squares there are.  
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