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四年级上册“三位数乘两位数”这部分教材中注意了引导学生探索运算中的数量关系,经历将运动中的具体问题抽象成数学模型“速度×时间=路程”的全过程。但令人遗憾的是,整数乘法解决问题中还存在着很多简单的具有实际背景的数量关系,而且这些数量关系都可以用路程关系式进行表达,但教材中并没有涉及,诸如义务教材中的“单价×数量=总价”“单产量×数量=总产量”“工作效率×工作时间=工作总量”等,以至于有些学生遇到类似问题时感到有些棘手,甚至束手无策。为此,我产生了在整数乘除法解决问48
The fourth grade on the book “three figures by two ” This part of the textbook to guide the students to explore the quantitative relationship between the number of experiencing the movement of specific problems abstracted into a mathematical model “speed time = distance ” The whole process. However, it is regrettable that there are still many simple quantitative relations with practical background in the integer multiplication problem solving, and these quantitative relationships can be expressed in a range relational formula, but the teaching materials are not involved, such as compulsory education materials “Unit price x number = total price ” yield quantity total output “” working efficiency working time = total amount of work "and so on, so that some students feel a bit tricky when they encounter similar problems, Helpless. For this reason, I generated a multiplication and division in integer query Q48