Abstract
Responses to problems involving rates of change were compared across four
data collections throughout an introductory calculus course given to a group
of first year university students, all of whom had studied calculus at school.
The course focused on derivative as instantaneous rate of change, and
employed a method based on examining graphs of physical situations. The
number of students who could symbolise rates in non-complex situations
increased dramatically, but no improvement was seen in complex items or in
items which required algebraic modelling. The results point to the critlcal
role of a developed concept of a variable in learning calculus, and are
interpreted by showing the inadequacies of abstract-apart concepts as
opposed to abstract-general ones.
Paul White & Michael Mitchelmore
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