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教学内容有层次、有坡度,学生动手操作和探求知识紧密结合,相互促进,这是达到课堂教学优化的有效途径。《三角形面积的计算》一节,我们分为四个层次进行教学。第一层次 1.说一说。①长方形和平形四边形的面积计算公式各是怎样的?②平行四边形的面积计算公式是用什么方法推导出来的? 2.数一数。出示教材中的方格图(画在小黑板上)让学生用数方格的方法,求出三角形的面积。 3.拼一拼。①教师出示两个完全一样的锐角
The teaching content has gradation, slope, students' hands-on operation and exploration of knowledge closely, promote each other, which is an effective way to achieve classroom teaching optimization. “Calculation of the area of the triangle” section, we are divided into four levels for teaching. First level 1. Let's talk. ① rectangular and flat quadrilateral area of the formula for each is what? ② parallelogram area formula is derived by what method? 2. Number one. Show the text in the grid chart (painted on the blackboard) to allow students to use a few squares method, find the area of the triangle. 3. fight together. ① teachers produce two exactly the same acute angle