在教学“十几减9”时,我让学生试算“15减9等于几”并说一说你的想法。结果让我非常惊讶,班上绝大部分学生都会做这道题,归纳一下共有四种解法:方法一:9加6得15,15减9等于6;方法二:15可以分成9和6,15减9等于6; When teaching “a dozen minus 9,” I asked the students to try “15 minus 9 is equal to a few” and to talk about your ideas. The results made me very surprised, most students in the class will do this problem, summed up a total of four solutions: Method one: 9 plus 6 15,15 minus 9 is equal to 6; Method two: 15 can be divided into 9 and 6, 15 minus 9 is equal to 6;