一、暗示——降低高度1.回顾“凑十歌”2.出示图片,计算三角形上三个数相加的结果,请学生说说怎么思考的。以上的教学片段是为接下来学习“9加几”作铺垫的。但不难发现,“凑十歌”也好,把三角形上的三个数加起来也好,都是在不同程度上暗示学生:用凑十法计算比较简便。如第2环节把三角形上的三个 First, the hint - to reduce the height 1. Review “Minato Ten Song ” 2. Show pictures, calculate the sum of the three numbers on the triangle results, ask the students to talk about how to think. The above tutorial is for the next learning “9 plus a few” for bedding. But not difficult to find, “Minato Ten Song,” Ye Hao, the triangle on the three numbers together, Ye Hao, are to varying degrees, suggesting that students: the use of Minato ten method is relatively simple. If the second part of the triangle on the three