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《三角形、平行四边形和梯形》教学以后,我开设了一节夏习课。内容之一是让学生按规定的数值分别画出所学过的基本平面图形。当我口述画出一个边长2厘米的正方形时,因口误错说成“画一个面积是2厘米的正方形”,出现了本节课的第一误。反应敏捷的学生立即纠正说:“老师,你这句话说错了,应改为‘画一个边长是2厘米的正方形’。”另一个学生补充说:“老师,这句话还可以改成‘画一个面积是2平方厘米的正方形’。”
After “Triangle, Parallelogram and Trapezoid” teaching, I set up a summer class. One of the topics is to have students draw the basic graphic they have learned on a regular basis. When I dictate a square of 2 centimeters in length, I made a mistake in my speech as “painting a square with an area of 2 centimeters.” The quick-response student immediately corrected and said: “Teacher, you're wrong, and should be changed to 'Draw a square with 2 cm sides.'” Another student added: “Teacher, this sentence can be changed to 'Draw a square with an area of 2 square centimeters.' ”