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.

This slideshow focuses on supporting details; it discusses their purpose, the audience, and the point to be made. It lists the five most common types of supporting details: facts, statistics, opinions, examples, and personal observations...

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.