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Stepping Stone Elementary Mathematics Basic 1-1 (2019)The students who are studying mathematics for the first time summarize their concepts from the mathematical point of view so that they can study mathematics properly in the future. Concepts learned in Grades 1 and 2 are very easy and simple to look at at an adults eye level, but understanding of the relationship between mathematical thinking and concepts formed at this time also leads to elementary and upper secondary mathematics learning. The stepping stone elementary mathematics fundamentals not only reflected the problem types of the new textbooks, but also the problems that can be understood from the mathematical point of view of concepts, and the problems of developing mathematical thinking power. In addition, [Review book] which can review the problem of Jindo book as 1: 1 can be separated and used for review and test preparation.