jdewaard

jaap griffioen jaap de waard realistic mathematics realistic mathematics education rotterdam university okahandja nied grade 1 lower primary; teachers; mathematics education inservice training strategies number line grade 3 grade 2 advisory teachers mathematics education in namibia mathematics 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 counting concept of counting mathematics education mathematics conference swakopmund education primary school measurement