With these words, the NCTM (1989, 65) portrays a dilemma familiar to many middle-grades teachers. Although many teachers strive to involve their students in active and challenging problem-solving activities, students' past experiences may have instilled preconceptions that mathematics is mechanical, uninteresting, or unattainable. In addition, many teachers lack models and examples of how to design mathematics instruction so that it fosters students' engagement. Because the middle grades are crucial years for developing students' future interest in mathematics, middle-grades teachers must take seriously the challenge of presenting mathematics as an exciting discipline that is relevant and accessible to all students. For the past two year, we have been experimenting with approaches that will inte rest students in challenging mathematics while supporting them in constructing meaning.
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