Abstract
This case study describes the ways in which problems involving additive differences with unknown starting quantities, constrain the problem solver in articulating the inherent quantitative relationship. It gives empirical evidence to show how numerical reasoning takes over as a Grade 6 student instantiates the quantitative relation by resorting to guess-and-check trials. Although our study focuses on a single case study and a set of limited tasks, analysis of the data brings forth the necessity to give more explicit curricular attention to additive differences.
Ajay Ramful & Siew Yin Ho