Scholastic
Scholastic: Multiple Ways to Solve a Problem
This Marilyn Burns lesson plan employs children's literature to teach the topics of combinations, perimeter, and area using a problem solving approach. Primary and intermediate levels have an activity appropriate to each.
Scholastic
Scholastic: I Spy
These interactive matching games for elementary age students combine visuals of familiar objects and rhyming riddles to create brain-teasing puzzles.
University of Cambridge
University of Cambridge: Nrich: Four Colors Problem
See if you can arrange the cubes according to the directions to solve this challenge. This one page website includes the solution.
University of Cambridge
University of Cambridge: Nrich: Two Stones Game
Sharpen your problem-solving and strategy skills while playing the interactive game, Two Stones. The rules are simple, but the game requires some thinking if you want to beat the computer. Watch as the play proceeds to see what it takes...
University of Cambridge
University of Cambridge: Nrich: Four Triangles Puzzle
Sharpen your logic and and pattern recognition skills with this four triangles puzzle. The solution is available to check your work.
University of Cambridge
University of Cambridge: Nrich: Train Carriages
On this one page website sharpen your logic and pattern creation skills while working on this challenge. The solution is available to double check your solution.