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这是一节北师大版小学数学二年级下册第一单元的内容。我反思的问题是:21个同学去划船,至少要租几条船?(1)先在图中收集解决问题所需的信息:每条船限乘4人。独立思考后在小组里讨论解决问题的方法,然后集体汇报。学生有多种不同的解题思路:①21÷4=5(条)……1(人)5+1=6(条)②4×5=20(人)5+1=6(条)(2)教师将除法作为重点进行整理和总结。21÷4=5(条)……1(人)①为什么这样列式?因为这与“把21人每4人分成1组,求分成了几组?”或“21里面有几个4”。
This is a section of Beijing Normal University primary school mathematics grade two volumes of the first unit content. My question is: 21 students to boating, at least to rent a few boats? (1) first in the map to collect the information needed to solve the problem: each boat limit by 4 people. After independent thinking in the group to discuss ways to solve the problem, and then collective report. Students have many different ways to solve problems: ①21 ÷ 4 = 5 (bar) ...... 1 (person) 5 + 1 = 6 (bar) ②4 × 5 = 20 (person) 5 + 1 = 6 ) Teachers will divide and summarize as the focus. 21 ÷ 4 = 5 (bar) ...... 1 (people) ① Why is this formula? Because this is different from “How many people are divided into 21 groups of 4 people divided into 21 groups?” Or “21” a; 4".