Abstract
The main subject is a ratio theme for third graders. The instructional text belonging to it was first submitted to an international, panel of experts. The reactions of the panel are reported and tested against classroom experiences.
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Streefland, L. Search for the roots of ratio: Some thoughts on the long term learning process (towards ... a theory). Educ Stud Math 15, 327–348 (1984). https://doi.org/10.1007/BF00311111
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DOI: https://doi.org/10.1007/BF00311111