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数学知识有它的系统性,但数学知识的教学又有它的阶段性,不同阶段的教学,要符合不同阶段儿童的年龄特征和认知水平。为了优化教学过程,提高教学效率,在教学要求和教学目标确定之后,还应通过对教材的钻研,正确把握住教学内容的深度和广度。现行教材《小时、分、秒》这一单元,是在学生已经初步认识整点钟的基础上来进行教学的。它的教学要求有两个:一是使学生认识时间单位小时、分、秒,掌握相邻两个单位时间的进率,即1小时=60分,1分=60秒;另一是通过对实物、教具的观察和演示,使学生会看钟面,能正确说出钟面上指示的时间,初步了解时间的计量方法。对于前一个要求,目标是明确的。但对于后一个要求,就不像前一个要
Mathematical knowledge has its systematicness, but teaching of mathematical knowledge has its phases. Teaching at different stages should accord with the age characteristics and cognitive level of children in different stages. In order to optimize the teaching process and improve the teaching efficiency, after the teaching requirements and teaching objectives are determined, the depth and breadth of the teaching contents should be correctly grasped through studying the teaching materials. The current teaching material “Hour, Minute and Second” is based on the students' initial understanding of the whole hour of teaching. Its teaching requirements are twofold: First, to make students know the hours, minutes and seconds of the time unit, and hold the rate of two adjacent units, that is, 1 hour = 60 minutes and 1 minute = 60 seconds; on the other hand, In-kind, teaching aids observation and demonstration, so that students will see the clock face, the clock can correctly say the indicated time, a preliminary understanding of the time measurement. For the previous requirement, the goal is clear. But for the latter requirement, it is not like the previous one