| Summary: | 碩士 === 國立臺南大學 === 應用數學系數學科教學碩士班 === 102 === Units teaching is the way of teaching decimal by concrete operation. In this research, we use puzzle, ruler, blocks, straw, as teaching aids which are different from traditional ways of teaching. This can help students to enforce learning of conversion and place-value of decimal, and to decrease the maze of learning and to be able to increase the effect of learning.
The research is based on quasi-experimental research, with the 4th grade students in Tainan Municipal Chong-Ming elementary school. The experimental group is with units teaching for conversion and place-value of decimal, designed by researcher while the control group is with traditional teaching. The research outcome was analyzed through both the quality and the quantity method. By using the descriptive statistics and contingent T sample examing to analyze the assessing results, the researcher semi-structured interviewed one pupil from the lower, the middle and the higher level in order to look into pupils’ progress before and after the teaching. The results are as follows：
1.The post-test results of the experimental group are better than the control group.
2.The delay-test results of the experimental group have retention effects.
3.Units teaching for decimal can help students understand more about the concept of conversion and place-value.
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