Publication Date
| In 2026 | 0 |
| Since 2025 | 0 |
| Since 2022 (last 5 years) | 0 |
| Since 2017 (last 10 years) | 0 |
| Since 2007 (last 20 years) | 1 |
Descriptor
Author
| Christou, Konstantinos P. | 1 |
| Hatzinikita, Vassilia | 1 |
| Koulaidis, Vasilis | 1 |
| Mertens, Lieve | 1 |
| Vamvakoussi, Xenia | 1 |
| Van Dooren, Wim | 1 |
Publication Type
| Journal Articles | 2 |
| Reports - Research | 2 |
Education Level
| Elementary Secondary Education | 1 |
| Grade 9 | 1 |
| Secondary Education | 1 |
Audience
Location
| Greece | 2 |
| Belgium | 1 |
Laws, Policies, & Programs
Assessments and Surveys
What Works Clearinghouse Rating
Direct linkVamvakoussi, Xenia; Christou, Konstantinos P.; Mertens, Lieve; Van Dooren, Wim – Learning and Instruction, 2011
It is widely documented that the density property of rational numbers is challenging for students. The framework theory approach to conceptual change places this observation in the more general frame of problems faced by learners in the transition from natural to rational numbers. As students enrich, but do not restructure, their natural number…
Descriptors: Foreign Countries, Mathematics Instruction, Comparative Education, Intervals
Peer reviewedHatzinikita, Vassilia; Koulaidis, Vasilis – Research in Science and Technological Education, 1997
Explores both the qualitative and quantitative dimensions of pupils' ideas related to conservation during state changes of water. Analysis of questionnaire data indicates that qualitative understanding precedes quantitative. Contains 18 references. (DDR)
Descriptors: Chemistry, Cognitive Structures, Concept Formation, Conservation (Concept)
