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Chris Harrow

Pick's Theorem (with holes!) - 0 views

jwilson.coe.uga.edu/...pick_main.htm

pick's theorem area geometry proof holes shultz

shared by Chris Harrow on 21 May 14 - No Cached
  • Chris Harrow on 21 May 14
     
    Proof by Kyle Schultz Particularly nice is the end of the page where Kyle incorporates holes into Pick's Theorem.
Chris Harrow

Twitter / jamestanton: Does every power of 76 end ... - 1 views

twitter.com/...497715502178131968

tanton exponents Proof

shared by Chris Harrow on 09 Aug 14 - No Cached
  • Chris Harrow on 09 Aug 14
     
    Once a student understands exponents, this is a brilliant problem to inspire student thinking.... Even if you just do the 2-digit version...
Chris Harrow

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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