1 Faculty of Mathematics and Natural Sciences, Institute of Mathematics Education, University of Cologne, Cologne, Germany 2 Faculty of Education, University of Hamburg, Hamburg, Germany In this ...
Problems are often answered in mathematics by solving equations. We use letters to represent an unknown number or value. To solve an equation, we need to find what number the letter in the equation ...
Contributors: Adam Fourney, Gagan Bansal, Hussein Mozannar, Cheng Tan, Eduardo Salinas, Erkang (Eric) Zhu, Friederike Niedtner, Grace Proebsting, Griffin Bassman ...
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