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Ely, Robert; Adams, Anne E. – Mathematics Education Research Journal, 2012
One of the most significant steps in learning algebra is understanding the change in the role of letters in mathematical expressions from unknowns to variables. We describe the historical development of this change in usage, starting with the ancient use of mathematical unknowns, detailing several important changes in practice that allowed for the…
Descriptors: Algebra, Mathematics Instruction, Mathematical Concepts, History
Novotna, Jarmila; Hoch, Maureen – Mathematics Education Research Journal, 2008
Many students have difficulties with basic algebraic concepts at high school and at university. In this paper two levels of algebraic structure sense are defined: for high school algebra and for university algebra. We suggest that high school algebra structure sense components are sub-components of some university algebra structure sense…
Descriptors: High Schools, Algebra, Equations (Mathematics), Foreign Countries
Hallagan, Jean E. – Mathematics Education Research Journal, 2006
The purpose of this article is to describe a middle school mathematics teacher's model of his students' responses to algebraic tasks involving equivalent expressions and the distributive property. The teacher engaged in two model-eliciting activities designed for teachers by creating a library of his students' work and an accompanying "Ways…
Descriptors: Mathematics Teachers, Algebra, Mathematical Formulas, Mathematical Models