4L Ma.Knowing and Teaching Elementary Mathematics[M] Lawrence.1999.
5L. Resnick,D. Resnick. Assessing the Thinking Curriculum: New tools for educational reform[A]. B. Gifford,M. O'cormor. Changing assessmets: Alternative views of aptifucle, achieveraent and instruction[C]. Boston MA: kluwer, 1992.
7B. Greet. Multiplication and Division as Models of SituaUons[A]. D. Grouws. Handbook of Research on Mathenmtieal Teaching and Learning [C]. Macmillan. 1992.
