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Kurniawan, Henry; Putri, Ratu Ilma Indra; Hartono, Yusuf – Journal on Mathematics Education, 2018
The purpose of this research was to show open-ended questions about surface area and beam volume which valid and practice, have potential effect. This research is research development which consists of two main phases: preliminary phase (preparation phase and problem design) and formative evaluation phase (evaluation and revision phases). The…
Descriptors: Scientific Concepts, Questioning Techniques, Geometry, Mathematics Instruction
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Pramudiani, Puri; Zulkardi; Hartono, Yusuf; van Amerom, Barbara – Indonesian Mathematical Society Journal on Mathematics Education, 2011
Learning about decimals is an important part in mathematics. However at the same time, decimals are known as the abstract numbers for students. Mostly in Indonesia, decimal is taught only as another notation for fractions or percentages. There are no meaningful references for them such as the use of concrete situations. This study aimed at…
Descriptors: Foreign Countries, Arithmetic, Mathematics Instruction, Teaching Methods