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2. The Spontaneous Emergence of Elementary Number-Theoretic Concepts and Techniques in Interaction with Computing Technology
3. Coordinating Invisible and Visible Sameness within Equivalence Transformations of Numerical Equalities by 10- to 12-Year-Olds in Their Movement from Computational to Structural Approaches
4. Negative Numbers in the Teaching of Arithmetic. Repercussions in Elementary Algebra.
5. Exploring Mathematical Connections of Pre-University Students through Tasks Involving Rates of Change
6. Arithmetic/Algebraic Problem-Solving and the Representation of Two Unknown Quantities
7. Uso del CAS (Computer Algebra Systems) Como Manipulador Simbólico en la Resolución de Problemas Verbales Aritmético-Algebraicos.
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