Abstract
Following earlier interest in mental computation and its relationship to number sense in the
early and primary years, this exploratory study investigated the mental computation competence
of students in the middle school. The study involved clustering the responses of four
students in grades 6 and 8 based on individual interviews. In each grade a student was
identified as more or less competent in mental computation performance on a pencil-and-paper
class test. Several contrasting content and performance features were identified and
examined with respect to implications for teaching mental computation in the classroom.
Annaliese Caney