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http://www.theproblemsite.com/  


Douglas Twitchell  
Math puzzles, brainteasers, strategy games, web quizzes, and informational pages. Flashpowered math games include Adders, Zap (slide tiles to move digits and add up to a specified sum), Side By Side (number rearrangement), One To Ten (given four numbers, use arithmetic and grouping symbols to form the numbers 1 through 10), Sub Triangles (subtraction), Magical Squares, Math Scramble, Secret Number, Fractional Hi Lo, Concentration, Monty Hall, and Entrapment (rearrange the gray circles in a grid so each red circle lies on the midpoint of a segment that connects them). Twitchell also explains the golden ratio, codes, and "slick math"  "elegant solutions" to the locker problem, finding interior diagonal of a rectangular prism, reciprocals of integers and divergent/convergent series, and more.  


Levels:  Late Elem. (35), Middle School (68), High School (912), Early College 
Languages:  English 
Resource Types:  Games, Problems/Puzzles, Reference Sources, Web Interactive/Java 
Math Topics:  Arithmetic/Early Math, Calculus (Single Variable), Coordinate Plane Geometry, Triangles and Other Polygons, Probability 
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