Vollmer, Kerryn Leigh2014-03-032014-03-032014-03-03http://hdl.handle.net10539/13988enMathematics - Study and teaching (Primary) - South Africa.Arithmetic - Study and teaching (Primary)Subtraction - Study and teaching (Primary)Why so negative about negative? : the intended, enacted and lived objects of learning negative numbers in Grade 7.Thesis