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“求比一个数多(少)几的数”的两种应用题都是求两数相差关系的应用题,它们共同反映了大数、小数、相差数三个量之间的联系。如果把两者结合起来教学,则便于及时对比、提前比较顺叙题和逆叙题。我们的具体设想是:一、精心设计准备题,理解基本概念教学“比……多”、“比……少”应用题,必须与“求相差数”应用题挂上钩,使学生进一步理解“同样多”、“谁与谁比”、“谁多谁少”、“相差数”等数学术语。为此,我们在教学中设计了以下三组题。
“Comparison of a number of more (less) a few of the number of” two kinds of application questions are seeking the difference between the two numbers of application questions, which together reflect the large number, decimal, the number of differences between the three links. If the combination of the two teaching, it is easy for timely comparison, narrative and anti-Syria questions ahead of time. Our specific ideas are: First, carefully designed to prepare the questions, understand the basic concepts of teaching “more than ... ...”, “less than ... ...” application questions, and “seeking difference” application questions linked to enable students to further understand “ As much, ”“ who is better than who, ”“ who is the one who is less, ”“ the number of differences, ”and other mathematical terms. For this reason, we have designed the following three groups of questions in teaching.