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The study was inspired by the necessity to advance professional learning for primary school teachers that might support them to proficiently teach the mathematics topic of number bases. This was after a base line study conducted at National In-Service Teachers College (NISTCOL) in 2014 by the...

Since the 1980s, mathematics educators around the world have accepted the view that to develop numeracy effectively, young children need initially to use strategies for mental calculation rather than to memorise textbook procedures. The term mental calculation refers to informal, often untaught...