Level 6: Structure of composite units of area 

At level 6 the student is able to create the structure of a rectangular array. That is, the student is able to visualise a column and row structure and has moved beyond simple counting of squares along a one-dimensional path. The rows and columns are conceptualised as composite units.

Coordinated row and column structure     Row structure                                     A lack of row orcolumn structure

Composite units of area