Logical Reasoning/Problem Solving
Math Challenges
Open Ended Math Problems
Mathwire - Standards Based Math Activities
Absurd Math
Nrich Math
Math Playground (includes logic activities)
Quia
Problem Solving Decks
Brain Teasers/Logic Puzzles
Math Games
Logic Crosswords
Logic Puzzles
Logic Games
More Logic Games
Set! Daily Puzzle
Brain Games
Rush Hour
National Library of Virtual Manipulatives (NLVM)
NLVM page that links to virtual pentominoes and tangrams
More virtual pentominoes
More virtual tangrams
Logic Matrix Puzzles
More Logic Matrix Puzzles
And More Logic Matrix Puzzles