Scott Foresman's Math Problems of the Week is a set of weekly math problems for students in grades 4-8. You can email your solutions. Included are examples of algebra, geometry, trigonometry, and calculus problems and solutions. Sphinx offers a variety of math and logic puzzles sorted by category and levels of difficulty for grades 9-12. Some solutions are provided.
Students can also contribute their own puzzles via email.
Strawberry Macaw's Puzzle Page. Strawberry Macaw's Puzzle Page features an online collection of illustrated logic puzzles for grades 4-8 including Chomp , a variation of Nim. Ultimate Online Review Book. These exams can be used as useful practice problems for students in grades 8-12. Vermont Mathematics Portfolio Program.