Abstract: This report is a follow-up study of the number concept masteringprocess of a 4-5 year old child. The result shows that under conditions ofeffective training and adequate drilling, the procedure of the child to masterpreliminary number concept enters a critical year. Counting and writingnumbers, using numbers as signs to calculate are most prominent in thisprocedure. To read and memorize the table of order of numbers, trying,error and sudden realization, counting fingers as a self-hint, transforms intothe development of the ability of oral counting. Counting according to differentnumber order is the main content in the development of oral counting. Thedevelopment of ability to count articles is obviously prior to the developmentof ability to count numbers orally. The development procedure of the first oneis: Counting one by one, counting by groups, and counting by parts. In fact,to read and memorize the different numeral tables will enable the child tounderstand and realize the basic types of numbers, the combining types ofnumbers and the relationship between them. Writing numbers is thedevelopment of counting ability, that will be "set", in the form of matter. Infact, reading and writing numbers are the main methods that will enable thechild to master and operate the "word-formation", of numbers, and promotethe development of counting ability, It is also an essential method used bythe child in raising his number conception level. In the course of masteringnumber concept by the child, the development procedure of calculating abilityis: plus and minus one by one, plus and minus by groups, and plus andminus with dividing and grouping of numbers. Calculating numbers (plus,minus, multiplication and division) is the method used by the child in learningnumber formation., it is also an important mothod used by the child in raisinghis level of conception of numbers.

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