都留市内保育所特別研究報告（Ⅲ）

Abstract

The author has been investigating how young children acquire the concept of numbers at Takara day-care center in Tsuru under a grant from Tsuru University for Special Researches. Since March 2011, we have also investigated in Miyoshi day-care center in Tsuru. As a result we have changed the title of these serial papers to “Special Research Report at Daycare Centers in Tsuru City” from “Special Research Report at Takara Day-Care Center”. The results of experiments which treated number concepts are explained and introduced in this paper. The experiments were carried out over seven days between October 2010 and March 2011. In chapter 2, the results of the experiment on October 4 with a class of 3-year old children are reported. In this experiment we examined the children’s abilities of comparing the cardinality, of understanding the equality of cardinalities smaller than 6, of making one-to-one correspondence between beats and cardinality fewer than 4, of comparing the cardinalities by piles, and of understanding of increasing. In chapter 3, the results of the experiment on October 25 with a class of 4-year old children are reported. In this experiment we examined the children’s abilities of understanding of increasing, of making piles of size 5, of comparing the cardinalities by piles. In chapter 4, the results of the experiment on November 4 with a class of 5-year old children are reported. The experiment treated the abilities of making piles of size 5, of comparing the cardinalities by bocks, and of understanding the one-to-one correspondence between piles and numerals. In chapter 5, the results of the experiment on December 20 with a class of 3-year old children are reported. The experiment treated the abilities of understanding the equality of cardinalities smaller than 6, of making one-to-one correspondence between beats and cardinality fewer than 4, of comparing the cardinalities by piles. In chapter 6, the results of the experiments on December 22 with a class of 4-year old children are reported. The contents of this experiment were similar to those of chapter 5.In chapter 7, the results of the experiment on February 1 with a class of 5-year old children are reported. The experiment treated the comparing ability of quantities by their five cardinality pile representation, the making ability of five cardinality piles, making ability of the corresponding numbers of piles, and understanding ability of pile sizes by the corresponding numbers. Chapters 8 and 9 report about the results of experiments at Miyoshi Daycare Center with a class of 5-year old children. In chapter 8, the results on March 1 are reported. The experiment treated the abilities of making piles of cardinality five, of understanding quantity by piles of cardilnality five, and of telling numerals corresponding to the number of piles. In chapter 9, the results on March 2 are reported. The results of the experiment about the abilities of understanding of comparing quantities by piles, of representing quantity by numbers, of comparing two piles by their numeric representation are presented.