四六（二十四） 四（六）二十四 （四）六二十四
乘法口诀不仅可 三个算式
以帮助我们求积， 之间有什
还可以求商。
么联系？
探究新知 小组讨论：观察下面3个算式，说一说你发现了什么？
4 × 6 = 24
24 ÷ 4 ＝ 6 24 ÷ 6 ＝ 4
乘法算式的积作为除法算式中的被除数，除法 算式中的除数和商是乘法算式中的两个乘数。
探究新知
一共有24个包子，每屉装4个，可以装几屉？
为什么 用除法？
24÷4=（ ）
…
…
… 24
求24共有里面每屉有几可分个4。
装给
屉 包 子
4
个
（ ） 个
小
猴Байду номын сангаас
探究新知
一共有24个包子，每屉装4个，可以装几屉？
… 24
4
…
24÷4=6（ ）
4×共有 （每屉）=可分24 装给
四屉包子（六）个 二十（）个 四
课堂练习 填一填
6×3 6÷3 18÷6 6÷2 6×5 2×3
三五十五
五六三十 二三得六
三六十八
15÷3 30÷6 5×3 30÷5 15÷5 5×6
课堂练习 看图写算式。
3 × 4 = 12 4 × 3 = 12 12 ÷ 3 = 4 12 ÷ 4 = 3
2 × 5 = 10 5 × 2 = 10 10 ÷ 2 = 5 10 ÷ 5 = 2
I love you more than I've ever loved any woman. And I've waited longer for you than I've waited for any woman.
I love you more than I've ever loved any woman. And I've waited longer for you than I've waited for any woman.
I love you more than I've ever loved any woman. And I've waited longer for you than I've waited for any woman.
I love you more than I've ever loved any woman. And I've waited longer for you than I've waited for any woman.I love you more than I've ever loved any woman.
小 猴
商是6
…
怎样用乘法 表示3个数 之间的关系？
探究新知 一共有24个包子，可以装6屉，每屉装几个？ 24÷6=（4 ）
为什么用 除法？
把24平均分成6份，求1份是多少。 （四）六二十四
商是4
探究新知
4×6＝24
24÷4＝6
24÷6＝4
6个4是多少？
24里面有几个4？
24平均分成6份， 1份是多少？
探究新知
4×6＝24
24÷4= 6
24÷6= 4
探究新知 试一试： 16÷4= 4 30÷5= 6 30÷6= 5
想：四（ 四 ）十六，商是（ 4 ）。 想：五（ 六 ）三十，商是（ 6 ）。 想：（ 五 ）六三十，商是（ 5 ）。
课堂练习 直接写出得数。
20÷4= 5 18÷6= 3 5÷5= 1 30÷5= 6 25÷5= 5 15÷5= 3 20÷5= 4 6÷2= 3 24÷4= 6 16÷4= 4
And I've waited longer for you than I've waited for any woman.
课堂练习
咖
COFFEE
啡
& YOU
之 恋 I love you more than I've ever loved any woman. And I've waited longer for you than
I love you more than I've ever loved any woman. And I've waited longer for you than I've waited for any woman.
D E S T I N Y & 1 P P T. C O M
I love you more than I've ever loved any woman. And I've waited longer for you than I've waited for any woman.
I've waited for any woman.
I love you more than I've ever loved any woman. And I've waited longer for you than I've waited for any woman.I love you more than I've ever loved any woman. And I've waited longer for you than I've waited for any woman.
I love you more than I've ever loved any woman. And I've waited longer for you than I've waited for any woman.
课堂练习
I love you more than I've ever loved any woman. And I've waited longer for you than I've waited for any woman.
思考：从图中你发现了什么数学信息？能提出什么 问题？
探究新知 说一说：任意选择两个信息，你能提出一个数学问 题并解答么？
1. 一共有24个包子。
2. 每屉装4个包子。
3. 装了6屉包子。
探究新知 每屉装4个，装6屉，一共有多少个包子？
4×6= 24
求6个4是多少。 四六（二十四）
为什么用 乘法？
如凡 逆心 旅所 ，向 一， 苇素 以履 航所 。往
， 生
课堂练习
DESTINY FREEDOM
清•新•画•册
I love you more than I've ever loved any woman. And I've waited longer for you than I've waited for any woman.
I love you more than I've ever loved any woman. And I've waited longer for you than
I've waited for any woman.
谢 谢 观 看
I love you more than I've ever loved any woman. And I've waited longer for you than I've waited for any woman.I love you more than I've ever loved any woman. And I've waited longer for you than I've waited for any woman.
课堂练习 列式计算。
（1）除数是3，被除数是18，商是多少？ 18÷3=6
（2）把30平均分成5份，每份是多少？ 30÷5=6
课堂小结
这节课你们都学会了哪些知识？
用乘法口诀求商
4×6＝24
24÷4＝6
24÷6＝4
6个4是多少？
24里面有几个4？
24平均分成6份， 1份是多少？
四六（二十四） 四（六）二十四 （四）六二十四
I love you more than I've ever loved any woman. And I've waited longer for you than I've waited for any woman.
情境导入
I love you more than I've ever loved any woman. And I've waited longer for you than I've waited for any woman.
人教版 数学 二五年级 下册
2 表内除法（一）
用乘法口诀求商（2）
情境导入 说一说计算时用的是哪句口诀。 4×2= 8 6×5= 30 2×9= 18 6×3= 18 5×5= 25 3×4= 12 2×4= 8 5×4= 20 20÷4= 5 35÷5= 7 12÷3= 4 10÷2= 5
探究新知