
06333058
j
2014e.00494
van Galen, Frans
van Eerde, Dolly
Solving problem with the percentage bar.
Indones. Math. Soc. J. Math. Educ. 4, No. 1, 18 (2013).
2013
Indonesian Mathematical Society (IndoMS), Palembang
EN
F83
percentage
model
design research
Summary: 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 teaching experiment the students were then taught the use of the percentage bar. Although the teaching experiment was very short  just one lesson  the results confirm that the percentage bar is a powerful model that deserves a central place in the teaching of percentages.