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[案例与评析]第一次实践:教学片段回顾:首先,从书本中的主题图开始呈现,让学生仔细观察,找找哪里有角?然后让学生从这些找到的角中进行分类,学生通过三角板上的直角进行比较,将角分为3类。接着,动手实践摆、画锐角和钝角。其次,从找角的过程中欣赏生活中的角。再次,安排拓展练习:从五角星、三角形、月亮、圆中找角,并说说是什么角。讨论:月亮、圆中有没有角?如何在圆上创造出一个角。最后,通过变角游戏感知锐角、直角、钝角三者之间的关系。
[Case and Analysis] First Practice: Review of Teaching Fragments: First, start with the theme map in the book and allow students to look closely and find where there are horns. Students are then asked to classify from these found corners and students pass Right angle on the board for comparison, the angle is divided into three categories. Then, hands-on practice, drawing acute and obtuse angle. Second, enjoy the angle of life in the process of looking for a corner. Again, arrange to expand exercises: find a corner from the five-pointed star, triangle, moon, circle, and talk about what angle. Discussion: the moon, the circle has a corner? How to create a corner on the circle. Finally, perceive the relationship between acute angle, right angle and obtuse angle through the variable angle game.