tigerlihao

This plugin can let you add mathematical equations to your posts using latex. 
Google chart API is used in this plugin to turn the latex strings to equation images. 
The equation images will be stored on your site, so it will be efficient.
To add equations in your articles, just surround the latex script with <code>[eq]</code> and <code>[/eq]</code> tags. 
For example, add following codes <code>[eq]\alpha+\beta\geq\gamma[/eq]</code> in your posts.

Google Equation for WordPress

Using Google chart API for LaTeX to add mathematical equations as images.

oleksandr87

This is a simple mathematical equation game. The user is provided with three levels of difficulty (beginner, intermediate and professional). A certain amount of time is given to solve one equation. With each new equation, time will decrease by 1 second.

Funny Equations

This is a simple mathematical equation game.

Google Equation for WordPress vs Funny Equations