Faculty of Education - Theses

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End date: 1999 × Start date: 1994 × Subject: Decimal fractions × Subject: Study and teaching (Secondary) ×

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    The evolution of concepts of decimals in primary and secondary students
    Moloney, Kevin Gerard ( 1994)
    This thesis studies children's conceptions about ordering decimals. It builds upon previous work which established three commonly used systematic errors in children's understanding as they encounter decimal notation. Students were categorised according to erroneous rule usage. This work includes a small longitudinal study which showed little change over twelve months in rule usage by an Australian sample of 50 secondary students. The categorising tests were redeveloped to make them suitable for primary students and to have increased reliability. The main study traced the use of rules from Year Four to Year Ten in a sample of 379 students and showed how students with different rules performed on other decimal tasks. It was found that one of the rules, called the whole number rule (in comparing two decimals that with more decimal places is chosen as the larger) was important in earlier years but disappeared with time. The second rule, called the fraction rule (the decimal with fewer decimal places is chosen as the larger), persisted in worrying proportions well into the secondary years and it was shown that significant gaps in knowledge of decimal notation existed which had not corrected themselves with time. The third rule was shown to be not important. Further investigation of a longitudinal nature to examine how individuals actually make the transition to mastery of decimal notation is encouraged by this study.