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van 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
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Putra, Zetra Hainul; Darmawijoyo; Putri, Ratu Ilma Indra; den Hertog, Jaap – Indonesian Mathematical Society Journal on Mathematics Education, 2011
Knowing number facts up to 10 become crucial if we want students to solve addition and subtraction problems using more abbreviated strategies. Otherwise, students will keep counting one-by-one until they get an answer. One of important number facts is number pairs that make ten because it is an important "benchmark" that students will…
Descriptors: Foreign Countries, Grade 1, Mathematics Instruction, Mathematics Activities
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Yuberta, Kurnia Rahmi; Zulkardi; Hartono, Yusuf; van Galen, Frans – Indonesian Mathematical Society Journal on Mathematics Education, 2011
Many researchers found that students have difficulties in understanding area measurement. Students mostly focus on applying formula to find the area of certain shapes without knowing what the area is and why the formula works. It is important for the students to know what attribute being measured and to construct the unit for area measurement.…
Descriptors: Foreign Countries, Measurement, Geometric Concepts, Mathematics Instruction