Aki reviewed the results from last week's voting about our posters. Last week, our goal was to choose a typical textbook problem and change it to make it open ended in such a way as that it would elicit a many solutions. Two tables obtained 14% each 8/54: Table 1 and Table 6. Aki's PowerPoint Aki talked about the three types of open-ended problems: - A lesson using problems with multiple solutions (using these once a month in a class would be great)
- A lesson using problem with multiple solution methods - a typical problem - changed to be open-ended
- A lesson using an activity called "problem to problem." This is the subject of today's class
How is problem solving different from doing problems as an exercise? The problems given in problem solving should be ones that students don't necessarily know how to solve. In an exercise, students already know how to solve problem and are doing the exercises as practice. In this third variation of Open Ended Problems, students are given a basic problem. They then create own problem by changing original problem. At the end there is a period of comparing and discussing their problems. This method provides students with opportunities to become active constructors rather than passive receptors. Some teachers may worry whether kids have the potential to do this, but Aki urges that the students can, in fact, create their own problems. His example involved making squares with toothpicks. We explored this problem in our groups and came up with a variety of methods:
We then worked in our groups to formulate additional problems. Some of them were: How many toothpicks are needed to make an n x n square? We discussed these types of problems. What sort of difficulties might you anticipate with these problems? - Kids might create problems exactly like the teacher
- Trying to figure out WHAT to do
- The form of a question (givens and goals)
- Do we need an answer?
- Taking into account prior knowledge
- Students, when designing problems, may find themselves over their "mathematical" heads, as complexity can rise quickly.
- Constructing questions can be difficult as they attempt to verbalize them.
- Knowing how to ask the question correctly to avoid ambiguity & confusion is important.
- Students may know what they want, but can't adequately or completely explain.
- Some students may merely focus on the trivial, or change the pattern of the formula, not the mathematics.
- Not many students will think to extend into 3 dimensions but instead just focus on different shapes, arrangements.
What thoughts went through your head when making your problem? - Pattern Building
- Change the "Noun" in the problem
- Or the parameters, algorithm, outputs, inputs, givens, variables
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With program support provided by Math for America This material is based upon work supported by the National Science Foundation under Grant No. 0314808. |