An interactive lesson by HippoCampus on variables, expressions and equations.
http://tinyurl.com/5zwjvc

All of the HippoCampus interactive lessons can be found at
http://www.hippocampus.org/

The Magic Golpher will guess your number. How does it do it?

Two mind reading activities. The first one can be explained using knowledge of linear expressions, while the second one is just a bit of fun.

Click on the cyrstal ball to start. Follow the instructions.
Question 1: What is the secret? Hint: Record your answers and look for a pattern.
Question 2: How does it work? Hint: It uses ALGEBRA!