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课堂是学生的舞台,没有学生的精彩就没有课堂的精彩。在教学苏教版四上“画角”的内容时,我设计了一个用三角板画15°的角的问题。当时我的预设是:学生经过独立思考,小组合作,学会用60°减去45°得到15°,或者用45°减去30°得到15°。有一个学生还想到了用90°减去30°再减去45°的方法。接着,我问:“还有其他方法吗?”这时,一个平时不起眼的小男生走上前来,在黑板上画了一个30°的
Classroom is a student stage, there is no wonderful class of students without the wonderful. In teaching Sujiao version 4 “painting angle” of the contents, I designed a triangular plate painted 15 ° angle problem. At that time, my preconceived idea was that after independent thinking, the group cooperated and learned to subtract 45 ° from 60 ° to obtain 15 °, or subtract 30 ° from 45 ° to obtain 15 °. One student also came up with the idea of subtracting 90 ° from 90 ° minus 45 °. Then I asked: “Is there any other way?” At this moment, an ordinary little boy came up and drew a 30 ° on the blackboard