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建模点1:除数是整十数的口算方法模型教学内容:教科书第78-80页本部分内容主要教学整十数除整十数、整十数除几百几十数的口算,例1中安排了两个小题,第(1)小题是教学整十数除整十数的口算。教材呈现了分气球的情境,给出了“有80个气球”“每班20个”的信息,要求解决“可以分给几个班?”的问题,由此引出80÷20的口算。口算之后教材还安排了相应的除法估算,为试商做准备。“做一做”编排了3组式题,每组上下两题是有联系的口算、估算式题,意在帮助学
Modeling point 1: Divisor is the whole number of mouth count method model Teaching content: Textbooks 78-80 The main contents of this part of the whole teaching in addition to the whole number of ten, the whole number in addition to hundreds of dozens of count, Example 1 In the arrangement of two small questions, the first (1) is the teaching of the whole number of ten whole addition to the mouth count. The textbook presented a balloon-like situation, giving the message “There are 80 balloons ” “20” per class, asking for a solution to the problem of “How many classes can I assign?” ÷ 20 of the mouth count. After calculating the textbook also arranged the corresponding division of estimates for the trial to prepare. “Do one ” arranged three groups of questions, each of the upper and lower two questions are linked to the calculation, formula, intended to help learn