National Council of Teachers of Mathematics
The Math Forum: Problem of the Week
Math Forum has a site for problem of the week for Elementary, Middle, and High School. Subject areas include Pre-Algebra, Algebra, Geometry, and Pre-Calculus. Go through the archives of past problems dating back to 2001.
National Council of Teachers of Mathematics
The Math Forum: Algebra Problem of the Week
This Math Forum resource poses a weekly problem to students. If desired, students may submit their answers. Solutions are published the next week.