Abstract
Blanton and Kaput (2001) encourage teachers, especially in the primary school, to grow ?algebra eyes and ears? (p. 91). This is not an easy task when teachers? vision has for so long been restricted to thinking of arithmetic primarily as computation. This paper looks at how forms of thinking which do not rely on computation can be used with addition and subtraction number sentences. It looks at how these powerful forms of thinking are used by students in Years 5 to 7 in two schools, what distinguishes this thinking from computational thinking, and how consistently it is used by students across different problem types.