PBS
Pbs Learning Media: Logical Leaps: Fractions, Mixed Numbers, and Decimals on the Number Line
n this interactive, students use logic to solve three riddles involving a frog jumping contest and then place the contestants' jumps at the correct points on the number line.
Philosophy Pages
Philosophy Pages: Categorical Propositions
Introduces the method of categorical logic, as used in the deductive reasoning formalized by Aristotle. Author defines important terms very clearly and includes several good examples. A good place to start reading about logic.
Other
The Basics of Philosophy: Aristotle
A discussion of Aristotle's life and work, including his writings, his system of logical reasoning, and his contributions to different fields, such as politics, philosophy, and science.