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前段时间听了一节一年级下册数学课《认识图形(二)》第三课时《七巧板》。教材是这样编排的,先出示例3,利用七巧板拼三角形,看谁拼得多?接着做一做,用一套七巧板拼几个长方形?最后介绍七巧板的由来。一、课的开始,老师创设情景,介绍七巧板的演变过程师:观察七巧板,它是由几种图形组成的?每种图形有几个?分别是几号?二、出示刘谦变魔术学生按照教师的要求来拼图:1.从七巧板中选出两个最大的三角形,让学生变成正方形、三角形和其他图形。
A while ago, I listened to the first grade of the second volume math class “understanding of the graphic (b)” the third class “jigsaw puzzle.” Textbook is arranged in this way, the first example 3, the use of tangram puzzle triangle, to see who fight more? Then do one, with a set of jigsaw puzzle to fight a few rectangles? Finally introduced the origin of jigsaw puzzle. First, the beginning of the lesson, the teacher to create scenarios to introduce the evolution of jigsaw puzzle division: Observed Tangram, which is composed of several graphics? Each figure is a few? What are the number? Second, show Liu Qian magic students in accordance with the teacher Puzzle: 1. Pick the two largest triangles from the jigsaw puzzles and make them into squares, triangles, and other shapes.