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Barcelos Amaral, Rúbia; Hollebrands, Karen – International Journal of Mathematical Education in Science and Technology, 2017
Three textbooks from Brazil and three textbooks from the United States were analysed with a focus on similarity and context-based tasks. Students' opportunities to learn similarity were examined by considering whether students were provided context-based tasks of high cognitive demand and whether those tasks included missing or superfluous…
Descriptors: Textbooks, Foreign Countries, Geometric Concepts, Geometry