Math circles for elementary school students

Machine generated contents note: Introduction: Berkeley 2009 Drawing links and knots At the lesson Mysterious pictures Secret code At the lesson Answers Two logic problems About fractals and the powers of numbers Sierpinski triangle Fractal snowflake At the lesson Answers Squares and squares of numbers Cubes and cubes of numbers Homonyms and definitions in mathematics Random Maze At the lesson Answers Pascal's triangle Divisibility criterion by 3 Problems with matchsticks Difficult situation At the lesson Answers Weekend About sausages Flower pots Magic triangle An experiment with a triangle (The sum of angles in a triangle is 180°) An experiment with a quadrilateral (The sum of angles in a convex quadrilateral is equal to 360°) At the lesson Answers The game "Points on a circle" Three puzzles At the lesson Answers Two short problems Mysterious pictures

Contents note continued: Arithmetic operations Tropical arithmetic At the lesson Answers Beehive and clock Pizza No-glue paper chain Logic game "A not A" At the lesson Answers Negations Yes and No About the game 20Q At the lesson Answers Problems about guests The Treasure Island River Crossing problems At the lesson Answers Knights and a dragon One mirror Two mirrors Old lady in the mirrors Kaleidoscope Symmetry At the lesson Answers Pets Gnomes Silent cooperation Random choice with equally likely outcomes How to choose something absolutely randomly At the lesson Answers Christmas problems At the lesson Answers Boys and girls Race At the lesson Answers Introduction: Manhattan 2011 M.1.Counting rhymes M.2.Arithmetic M.3.More coded pictures M.4.Make your own problem M.5.Cut the square M.6.Siege of the fortress M.7.More logic problems

Contents note continued: M.8.Estimates

M.9.Problems with unknowns

M.10.Knots, links, and paths

M.11.How old are you?

M.12.No solutions.