The purpose of this study was to investigate teachers' subject matter knowledge relevant to the teaching of informal line of best fit. Task-based interviews were conducted with nineteen pre-service and in-service mathematics teachers. The results include descriptions and categorizations of teachers' conceptions, criteria for placement, accuracy of…

Research shows that unless university-based teacher educators effectively integrate technology into teacher education courses, students (pre-service and in-service teachers) are unlikely to use technology effectively in their own teaching. This creates negative repercussions in teacher education and in the schools. However, many teacher educators…