Abstract
The current investigation systematically contrasted teaching with cognitively demanding
(challenging) tasks using a task-first lesson structure with that of a teach-first lesson
structure in a primary school setting (Year 1 and 2). The findings indicate that there is more
than one way of incorporating challenge tasks into mathematics lessons to produce sizeable
learning gains. Analyses of interviews with teachers and students regarding their
perceptions of learning with challenging tasks suggest that each type of lesson structure has
distinct strengths. It is concluded that teachers should consider varying the structure of the
lesson to provide a range of learning experiences for students.