Abstract
This study investigated strategies used by Year five students to solve multi-digit whole number problems mentally and in written formats. The students participated in semi-structured interviews and the think-aloud strategy was used to determine the students’ metacognition. The results indicated that students experience more difficulty answering oral questions than written questions. In particular subtraction and division questions proved more troublesome for students. The range and type of strategies used was indicative of the level of cognitive understanding of the students.