Other
Foundation for Critical Thinking: Elemental Structure for Analytical Thinking
Dissect the eight elements identified which make up the human thought process. Everyone thinks and everyone follows this course to produce thoughts.
Other
Harvard Business School: The Path to Critical Thinking by Stever Robbins
An article written by Stever Robbins discussing how to become a critical thinker. This is written from a business perspective but the ideas can easily be applied to education.
University of Cambridge
University of Cambridge: Nrich: Games Frogs
Use this interactive game to improve your knowledge and understanding of patterns and algebra. Can you describe a rule to follow where you make the least moves? Just follow the instructions below it.