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Download full textvan Galen, Frans; van Eerde, Dolly – Indonesian Mathematical Society Journal on Mathematics Education, 2013
At the end of primary school all children more of less know what a percentage is, but yet they often struggle with percentage problems. This article describes a study in which students of 13 and 14 years old were given a written test with percentage problems and a week later were interviewed about the way they solved some of these problems. In a…
Descriptors: Problem Solving, Mathematical Concepts, Interviews, Middle School Students
Murdiyani, Nila Mareta; Zulkardi; Putri, Ratu Ilma Indra; van Eerde, Dolly; van Galen, Frans – Indonesian Mathematical Society Journal on Mathematics Education, 2013
Subtraction has two meanings and each meaning leads to the different strategies. The meaning of "taking away something" suggests a direct subtraction, while the meaning of "determining the difference between two numbers" is more likely to be modeled as indirect addition. Many prior researches found that the second meaning and…
Descriptors: Subtraction, Mathematical Models, Mathematical Formulas, Problem Solving
