This study investigated middle school students understanding of unit and unitization concepts in measurement interpretations of rational numbers using the number line as a tool. Fifty-six seventh-grade students were pretested and five consecutive whole-class teaching experiments were developed and administered based on pretest results. Five students were later chosen for semi-structured clinical interviews, based on their conceptions of unit and unitization. StudentsÂ’ reasoning was induced from the analysis of pre- and post-tests, observations of classroom teaching episodes, videotapes of interviews, and transcriptions and photographs of student artifacts. Results suggested that unit identification created difficulty for students in locating rational numbers on number lines.
Key words: Rational Numbers, Unit, Unitization, Measurement
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