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工夫要花在刀刃上,练习要练在关键处。如果抓不住关键,盲目多练,必定使学生负担加重,教学质量上不去。怎样才称练得恰当,练在关键处呢?下面举几个例子加以说明。 1.新授20以内进位加法后,应该练什么?20以内的进位加法的关键是把较小的加数分成两个数,使其中一个数能与较大的加数凑成“10”。所以教学20以内的进位加法后,应着重让学生练习看大数,如何分小数。可以设计如下练习题: (1 )下面较小加数的分法对吗?
Time is spent on the knife, practice to practice at the key. If you can not grasp the key, practice more blindly, it will certainly make students more burdensome, teaching quality will not go up. How to practice properly, practice at the key? Here are a few examples to illustrate. What should be practiced after a new addition of up to 20? The key to carry-on additions within 20 is to divide the smaller ones into two so that one of them can be made “10” with the larger ones. Therefore, after the teaching of the addition of carry within 20, students should focus on practice to see the large number, how to fractional. You can design the following exercises: (1) The following small addendum right?