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【教学片断】《两位数加两位数的加法(进位)》教学师:34+16等于多少呢?请同学们利用已有的学具帮忙,也可以自己想办法写一写、算一算。有了结果之后,再在小组交流你的想法。(学生活动,教师巡视指导)师:谁来说一说你是怎样算的?生:我是用小棒摆的。先摆3捆和4根小棒,再摆1捆和6根小棒。3捆和1捆合起来是4捆,4根和6根合起来是10根,10根可以捆成1捆,4捆和1捆合起来是5捆,也就是50根。(如图1)
【Teaching Pieces】 “Two-digit plus two-digit addition (carry)” Teacher: 34 + 16 is equal to how much? Please use the existing school tools to help students can also write their own way to write, count one Count After you have the result, exchange your ideas in the group again. (Student activities, instructor tour guide) Teacher: Who says what you think? Health: I use a small stick placed. Put the first three bundles and four small sticks, and then put a bundle and six small sticks. Three bundles and one bundle are four bundles. Four and six bundles are ten bundles, ten bundles can be bundled into one bundles, and four bundles and one bundles are bundles of five bundles, that is, fifty bundles. (Figure 1)