CK-12 Foundation
Ck 12: Algebra: Problem Solving With Linear Graphs
[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.
Maths Challenge
Maths challenge.net: Problem Solving Database
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...