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            <title xml:lang="fr">Issues in modelling terms involving subtraction in a manipulative environment for linear equations—and a possible solution</title>
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              <p>In this paper, we present and utilize theories about interface design and didactical models to evaluate how existing manipulatives models for linear equations represent terms involving subtraction. We then outline a redesign of subtraction zones for algebra tiles that can be implemented on a screen. The presented work is intended to serve as an example case for theory-guided design of digital or digitally enhanced didactical models, anticipating the all-important learning activities with the resulting models.</p>
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