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Tool use and the development of the function concept: from repeated calculations to functional thinking. (English)
Int. J. Sci. Math. Educ. 10, No. 6, 1243-1267 (2012).
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A proposed instructional theory for integer addition and subtraction. (English)
J. Res. Math. Educ. 43, No. 4, 428-464 (2012).
2
A recipe for ratio. (English)
Math. Teach., No. 228, 30-32 (2012).
3
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