论文部分内容阅读
【教学片断】教学“两位数加三位数”的进位加法时,我出示了各年级借书情况统计图,让学生仔细观察后,进行了如下教学。师:求一年级和二年级一共借多少本图书,你会列算式吗?生:85+143。师:你会用竖式算出85+143的和吗?大家动手试一试。学生独立在本子上列式计算。师:谁来说说你是怎样算的?生:我是先从个位加起,5加3得8,个位上写8;4加8得12,向百位进1,十位写2;百位上1加1得2。所以得数是228。师:说得真完整。谁还想说
Teaching Pieces Teaching “two digits plus three digits ” carry addition, I showed a graph of borrowing books by grade, so that students carefully observe the following teaching. Teacher: How many books in the first grade and the second grade will you borrow? Teacher: You will use the vertical calculation of the sum of 85 + 143? We try it. Students are counted independently in this book. Teacher: Who is going to say how you did it? Student: I started with the first 5, added 3 to 8, the first 8; 4 plus 8 12, to the hundred into 1, 10 write 2; Hundreds of 1 plus 1 was 2. So the number is 228. Teacher: To be honest. Who would like to say