Other
Mr. Pitonyak's Pyramid Puzzle
Students estimate the cost of building an Egyptian pyramid with modern materials and ancient building methods in this math project.
Discovery Education
Discovery Education: Web Math: Solve a Set of Two Linear Equations
This WebMath site explains how to enter your two equations with two variables and solve for those variables. It explains step-by-step how to solve the equations and gives the final solutions.
Science and Mathematics Initiative for Learning Enhancement (SMILE)
Smile: Estimation Contest
A lesson plan that teaches the power of estimation and its uses, a distinction between estimation and guessing.