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【教学背景】浙教版教材将原本属于不同内容领域的“长方形的周长与面积”、“乘法分配律”、“两位数乘两位数”等内容整合在一个单元中。从算理上将面积计算与乘法意义沟通起来,注重数形结合等思想方法的渗透,是本教材的一大特色。本节课是在学生已经学习了长方形和正方形周长和面积基
Teaching background: The textbook of the Zhejiao edition originally integrates the contents of “the perimeter and the area of the rectangle”, “the law of multiplication and division”, “the double digit and the double digit” originally belonging to different content fields Unit. It is a major feature of this textbook that to communicate the calculation of area with the meaning of multiplication, and to pay attention to the infiltration of ideas and methods such as the combination of figures and figures. This lesson is based on students having learned about the circumference and area of rectangles and squares