The activities outlined here can be combined to form a single lesson about mathematical knots, or a larger investigative unit that extends over a longer period of time. The sequence in which the activities are listed is roughly in order of increasing difficulty and challenge. The site contains a vocabulary section, an activities section, and an evaluation section. Print it out, and you've got a ready problem set for your students. Seems best suited for computation exercises with algebra students, but it probably has other uses as well.
Web Site contains word problems for students and teachers.
The problems are classified into grade levels from Grade 5 to Grade 12. This is not a test, but a set of carefully selected problems which can help you improve your problem solving skills. It works if you try to carefully think about how you would solve each problem, and once you have found the solution, you make sure that you understand all parts of the solution. You can try any problem you like and if the problem is a little difficult you can get helpful hints by following the hints link. Complete solutions are available to teachers with e-mail addresses upon request.