Need some challenging problem-solving work for your students in the following areas: Discrete, Geometry, Numbers, and Code Breaking? This is the place for an enormous database of problems aimed at high school age students. They are...

[Free Registration/Login may be required to access all resource tools.] Devise a problem-solving strategy that uses a graph to solve real-world problems.

At this one page site you can work through step by step a sample problem that illustrates the problem solving strategy for "Write a number sentence." The answer is right there to help you check your thinking.

At this one page site you can work through step by step a sample problem that illustrates the problem solving strategy for "Working backwards." The answer is right there to help you check your thinking.

At this one page site you can work through step by step a sample problem that illustrates the problem solving strategy for "Make a table." The answer is right there to help you check your thinking.

At this one page site you can work through step by step a sample problem that illustrates the problem solving strategy for "Make a list." The answer is right there to help you check your thinking.

Use the diagram on this one page website to solve the problem. There are teacher notes and the solution is only a click away.

[Free Registration/Login may be required to access all resource tools.] Develop and use the strategies of guess and check and work backward.

At this one page site you can work through step by step a sample problem that illustrates the problem solving strategy for "Draw a picture." The answer is right there to help you check your thinking.

[Free Registration/Login may be required to access all resource tools.] Solve word problems using the guess, check, and revise strategy.