Game of Nim

Nim is a great game to play in the math classroom. This video gives the winning strategy (based on the powers of 2) and how it might be presented on a white board in a math class.

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Pigeonhole Puzzles part 2...

Pigeonhole Puzzles part 1...

Teach Adding and Subtracting...

Bowling Pin Puzzles part 1...

The Harmonic Mean part 2...

The Harmonic Mean part 1...

Completing The Square Backwards...

The Quadratic Formula and a Formula for All Pythagorean Triangles...

Mathematics for Social Justice by Marc Roth.