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近日,接到公开课教学任务,顺应教学进度,自然选择了苏教版小学数学四年级下册第三单元“认识三角形”一课。曾经上过公开课:从“红+蓝>黄”、“红+黄>蓝”到“黄+蓝>红”……百般缭绕之后,学生终于揣摩着、附和着得出“两边之和要大于第三边”。缤纷的课件、复杂的板书、繁复的我问你答……此番场景,纠结于脑海。于是,尝试着换一种方式走进课堂。删繁就简三秋树——环节不在多,有生就行教学预案:一、课前预习(课本22页例题到24页想想做做3)1.课前想办法做一个三角形(可借用学具袋提供的相关材料)。说一说三角形有几条边?几个角?几个顶点?
Recently, received a public lesson teaching tasks, conform to the progress of teaching, natural selection of the Sujiao Primary School mathematics grade four volume third unit “cognitive triangle ” class. Have had an open class: from “red and blue” yellow “,” red and yellow> blue “to ” yellow and blue> red “... all around, the students finally figured out, ”The sum of the two sides should be greater than the third one." Colorful courseware, complicated blackboard, complicated I ask you answer ... This scene, tangled in my mind. So, try another way into the classroom. Pre-class preview (textbook page 22 to 24 questions think about doing 3) 1. Before class to do a triangle (you can borrow the school bag to provide Related materials). Say a few sides of the triangle? Several corners? Several vertices?