摘要：The purpose of this study was to examine the development of rational counting,addition and subtraction competence and the correlation between competence in rational counting,addition,and subtraction in three-,four- and five-year-old children. The subjects were 156 preschoolers living in Seoul. The experimental materials consisted of a set of 20 props for rational counting,addition,and subtraction tasks. The addition and subtraction tasks each consisted of a set of 6 problems. The data were analyzed by ANOVA,Duncan multiple range test,and Pearson`s r. The results indicated that 1) there were significant differences in the development of competence in rational counting,addition,and subtraction by age,2) there were no significant differences in competence in rational counting,addition,and subtraction by gender,3) there were positively high correlations of competence rational counting,addition,and subtraction by age.
