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                <editor>Uffe Thomas Jankvist</editor>
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                <term xml:lang="en">Problem sets</term>
                <term xml:lang="en">Classroom environment</term>
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              <p>Despite the challenges of teaching mathematics to diverse learners and the importance of students engaging in cognitively demanding tasks, practice-based research on instruction that combines these priorities is relatively rare. In this paper, a primary mathematics laboratory is used as the setting for implementing such instruction. Records of practice – including video records of teaching, lesson plans, and student work – are analysed to identify task characteristics and teacher actions that supported differentiated instruction and work on challenging tasks. Among the themes identified are the teacher actively guiding the students’ learning, the establishment of classroom norms, and enabling all students to act as resources for one another’s learning.</p>
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