jdewaard

jaap griffioen jaap de waard realistic mathematics realistic mathematics education nied okahandja rotterdam university grade 1 inservice training lower primary; teachers; mathematics education number line mathematics grade 2 grade 3 advisory teachers mathematics education in namibia strategies counting concept of counting mathematics education mathematics conference swakopmund education primary school measurement computation up to 20 computation up to 100 one time less one time more doubling halving multiplication division times tables splitting stringing stepwise addition stepwise subtraction empty number line splitting strategy calculation up to 100 10-frame 20-frame computation calculation up to 20 teaching learning trajectory teaching materials