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小学生思维的特点是以形象思维为主,逐步向抽象思维过渡,凡是具体形象的东西他们就容易理解,易于接受。在教学中恰当地运用直观教具,既能唤起他们的有意注意,提高学习兴趣;又能帮助他们弄清数量关系,正确列式解题。我教数学第九册百分数应用题第70页上的例5:一桶汽油,倒出40％,刚好倒出12升。这桶汽油有多少升?先布置学生看书,要学生理解题中“倒出40％,刚好是12升”这句话是什么意思?学生议论了一会儿,我便拿出事先画好的油桶剖面图演示给学生看,我问学生,这桶汽油的总升数是已知的还是未知的?知道这桶汽油倒出40％,正好是12升,要求这桶汽油的容
The characteristics of primary school students thinking is based on the image of thinking, and gradually to the abstract thinking of the transition, any concrete image of something they are easy to understand and easy to accept. Appropriate use of visual aids in teaching, both to arouse their interest and interest to learn; but also to help them understand the relationship between quantity, the correct formula solving problems. I teach math ninth volume percentage application problem Example 5 on page 70: a barrel of gasoline, pour 40%, just pour 12 liters. What is the meaning of the phrase “pour 40%, just 12 liters?” The students talked for a while, I took out a good draw of oil drums Sectional presentation to the students, I asked the students, the total liter of gasoline is known or unknown? Know this barrel of gasoline poured 40%, just 12 liters, request the barrel of gasoline capacity