Contents contributed and discussions participated by Chris Harrow - Hawken Math

Five Triangles: 209. Number squares - 0 views

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problem solving proof 5 triangles

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Five Triangles: 42. Hyperbola - 0 views

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pedagogy problem solving

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Chris Harrow on 13 Dec 14

Read the 2 comments at the bottom of the post. Brilliant and spot-on 2nd comment.

<div class="cArrow"> </div><div class="cContentInner">Read the 2 comments at the bottom of the post. Brilliant and spot-on 2nd comment.</div>

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Math Craft Inspiration of the Week: Marble Binary Calculators & Other Mechani... - 0 views

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youtube binary physical calculator

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One-Piece Origami Octahedron - YouTube - 2 views

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octahedron origami

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How to fold an origami modular Dodecahedron - YouTube - 0 views

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origami modular dodecahedron

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Using our Zometool set to help with a challenging AMC 10 problem | - 0 views

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zometool zome geometry cube octahedron

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Origami Bascetta Star by Paolo Bascetta (Folding Instructions) - YouTube - 0 views

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origami star youtube

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Origami 8 point star by Robert Neale - YouTube - 0 views

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origami ninja star youtube

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Chris Harrow on 01 Dec 14

for 4-5 math club

<div class="cArrow"> </div><div class="cContentInner">for 4-5 math club</div>

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The Trouble With Bright Girls | Psychology Today - 0 views

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Dweck psychology gender mindset

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This Teacher Taught His Class A Powerful Lesson About Privilege - 0 views

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pedagogy privilege

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Cyclic fractions | John D. Cook - 1 views

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fractions cyclic

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Chris Harrow on 13 Nov 14

Another math boundary...

<div class="cArrow"> </div><div class="cContentInner">Another math boundary...</div>

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Magic Square -- from Wolfram MathWorld - 0 views

mathworld.wolfram.com/MagicSquare.html

Proof uniqueness

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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.

<div class="cArrow"> </div><div class="cContentInner">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. </div>

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