小学数学三册P.89例5的教学,可通过摆、比、读、讲、议、练等手段,让学生理解和掌握求比一个数少(多)几的应用题的解法。一、摆一摆,比一比,增强感性认识。 1.相等数量对应摆。要学生拿出事先准备的小棒,先10根摆一横行,又拿10根与上行对应再摆一行。问:“哪行小棒多?”(生:同样多。)以增强“同样多”的概念。 2.不等数量相应摆。要学生在第二行再摆3根小 Primary Math Three P.89 Example 5 teaching, through the pendulum, than, reading, speaking, discussion, practice and other means to enable students to understand and grasp a few (more) a few application of the solution. First, put one by one, than one, to enhance perceptual knowledge. Equal number corresponding to the pendulum Students should come up with a small stick prepared in advance, the first 10 put a rampant, but also take 10 corresponding with the upside and his party. Q: “Which line is much more?” (Students: same as many.) To enhance the “same as many” concept. 2, ranging from the corresponding number. Ask students to put 3 small pieces on the second line