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【教学内容】苏教版三年级上册第46~47页。【教学目标】1.知识与技能。通过实践活动加深对长方形、正方形特征的认识和对图形周长含义的理解,进一步掌握长方形、正方形周长的计算方法。特别是对不规则图形周长的寻找和测量,进一步丰富对周长的认知。2.问题解决与数学思考。让学生在实践活动中探究正方形重合的周长变化规律,通过画一画等活动感受周长与长和宽之间的内在联系,学会辩证地思考问题。同时,在圆等图形周长的测量比较中感受化
【Teaching content】 Sujiao version of the third grade on the 46 ~ 47 pages. 【Teaching Objectives】 1. Knowledge and skills. Through practical activities to deepen the understanding of rectangular and square features and the understanding of the meaning of the graphic perimeter, to further grasp the calculation method of rectangular and square perimeter. In particular, the search and measurement of irregular graph circumference further enriched the knowledge of the circumference. Problem solving and mathematical thinking. Let students explore the law of variation of perimeter of square coincidence in practice and experience the inner connection between perimeter and length and width through drawing and painting activities and learn to think dialectically. At the same time, in the circle and other graphic perimeter measurement comparison feel