Many "tricks" can be explained with algebra.
        Here are several that can be used in your classroom.

General MacArthur's Favorite Number Game   Phone Number Trick
Your Age by Eating Out   What's Your Favorite Class?
Guess a Birthday   Brothers and Sisters Trick
Some Number Tricks   Number Trick
Age Trick   Domino Trick
Fibonacci Trick   Overhead Projector Trick
Calendar Trick #1   Calendar Trick #2
Repeat Yourself   Six Consecutive Numbers Trick
MacArthur's Favorite Number Game, Version 2   Card Trick
Card Trick #5   Three Piles Card Trick