Based on the observation of present situation of mathematics learning and teaching, and based on the analysis and thinking of typical case of mathematics learning and teaching, and with the investigation about some primary school teachers, the thesis believes that the effective learning and teaching must be constructive. On the basis of it, the thesis analyzes the essence of construction, and takes second look of mathematics learning and teaching with constructivism. Lastly, as the consequence of the research, the thesis puts forward the constructive instructional strategy of mathematics. |