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Math Stories: Write a Number Sentence
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.
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Diagram Showing the 7 Seven Step Problem Solving Cycle
Although written for the university level student, this article provides good ideas for all learners about problem solving skills. It provides a definition as well as a seven step process for how to problem solve.