“时、分、秒的认识”这节课,其教学重点是让学生认识时间单位,初步建立1分、1秒的时间观念,难点是掌握时间单位换算。新《课程标准》强调数学与现实生活的联系,要求数学教学必须从学生熟悉的生活情景和感兴趣的事情出发,使他们体会到数学就在身边,也感受到数学的趣味和作用,增强数学应用意识。在导入新课时,教师出示课本中的主题图,请同 “Hour, minute, second ” This lesson, the focus of their teaching is to enable students to understand the time unit, the initial establishment of 1 minute, 1 second time concept, the difficulty is to master the conversion of time units. The new “curriculum standard” emphasizes the relation between mathematics and real life, and requires mathematics teaching must proceed from the students’ familiar life situations and interesting things, make them realize that mathematics is at their side, feel the taste and function of mathematics, and enhance mathematics Application awareness. When introducing a new lesson, teachers should show thematic images in the textbook