Abstract
With the importance and students’ difficulties with the number line in learning fractions, this study aims to investigate prospective teachers’ textbook fraction task modification using the number line and identify their strengths and weaknesses. The analysis of 58 prospective teachers’ modification tasks about fraction concept and addition and subtraction of fraction indicated that the prospective teachers chose a wide range of topics in the textbooks and modified the external contexts and types of the number lines. Moreover, the prospective teachers showed strengths in making efforts to help students understand the number line such as designing additional number line activities and anticipating students’ strategies about the modified number line tasks. However, some limitations and mathematical errors were found in modifying the tasks in a conceptual way and establishing specific lesson plan for the modified tasks.
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