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【原题再现】苏教版数学五年级上册第112页有这样一道复习题:计算右边图形的面积。课上学生很顺利地解出这道题,汇报时出现了两三种方法,然后我追问:还有别的方法吗?学生对这道题开始了深度思考,尝试、交流、展示,一共出现了9种方法,大致可以分成三类。第一类,分割成一个三角形和一个正方形、一个三角形和一个梯形、六个等腰直角三角形等。第二类,补成一个直角梯形。第三类,转化
[Original title reproduction] Sujiao version of mathematics fifth grade on the first 112 pages there is such a review questions: calculate the area of the right graph. Students in the class solved the problem smoothly. Two or three methods appeared during the report. Then I asked: Are there any other ways? Students started to think deeply, try, communicate, display and appear altogether The nine methods can be roughly divided into three categories. The first category, divided into a triangle and a square, a triangle and a trapezoid, six isosceles right triangle and so on. The second category, make up a right-angle trapezoid. The third category, conversion