Aboagye, G.K. and Graham, E.O. 2018. Procedural problem-solving approaches employed by students in learning extensive and intensive quantities of change of state: Procedural problem-solving approaches employed by students in learning procedural problem-solving approaches employed by students in learning extensive and intensive quantities of change of state. Ghana Journal of Education: Issues and Practice (GJE). 4, (Dec. 2018), 19–43. DOI:https://doi.org/10.47963/gje.v4i.492.