Abacus [ http://www.abacushome.info ]
Informative website on the abacus - the invention that laid the foundation of modern science and technology. - [Read more]

Math Lesson Plans [ http://www.freehomeworkmathhelp.com ]
The free math help listed here can help with math lesson plans in geometry, trigonometry as well as algebra and calculus. The free quizzes can help with solving homework problems by including solutions along with the actual questions. Other subjects included are probability and statistics. - [Read more]

Quadratic Equation Calculator (and more!) [ http://www.akiti.ca/Quad2Deg.html ]
The Quadratic Equation Solver posted on this page solves for both real and imaginary (if applicable) results. Also on this site: solvers for the Cubic and Quartic equations, N Equations in N Unknowns, Eigenvalues and Eigenvectors, Cubic Spline Interpolation, Numerical Integration, and Least-Squares Data-Fitting. - [Read more]