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1、积的的变化化规律律 合作伙伴：刘智明合作伙伴：刘智明62620 620010454121208040120020204（1）（2）比比谁最快比比谁最快一、复习导入一、复习导入观察下面两组题，说一说你发现了什么？观察下面两组题，说一说你发现了什么？观察下面两组题，说一说你发现了什么？观察下面两组题，说一说你发现了什么？二、探究新知二、探究新知观察下面两组题，说一说你发现了什么。二、探究新知二、探究新知观察下面两组题，说一说你发现了什么。二、探究新知二、探究新知62620 62001201200（1）1210454 80 40 20204（2）第（第（1）组题中，第）组题中，第2题同第题同第1题比
2、，因数题比，因数是怎样变化的？积是怎样变化的？是怎样变化的？积是怎样变化的？一个因数不变，另一个一个因数不变，另一个因数乘因数乘10，积也乘，积也乘10。二、探究新知二、探究新知第（第（1）组题中，第）组题中，第3题同第题同第1题比，因数题比，因数是怎样变化的？积是怎样变化的？是怎样变化的？积是怎样变化的？一个因数不变，另一个一个因数不变，另一个因数因数乘乘100，积也乘，积也乘100。62620 62001201200（1）1210454 80 40 20204（2）二、探究新知二、探究新知观察第（观察第（2）组题，因数是怎样）组题，因数是怎样变化的？积是怎样变化的？变化的？积是怎样变化的？
3、62620 62001201200（1）1210454 80 40 20204（2）二、探究新知二、探究新知 一个因数不变，另一个因数乘（或除一个因数不变，另一个因数乘（或除以）几（以）几（0除外），积也乘（或除以）几。除外），积也乘（或除以）几。二、探究新知二、探究新知 254100 25041000如果从下往上观察，第二如果从下往上观察，第二个因数没变，第一个因数个因数没变，第一个因数除以除以10，积也除以，积也除以10。我是这么举例的：我是这么举例的： 25410025041000从上往下观察，第二个从上往下观察，第二个因数没变，第一个因数因数没变，第一个因数乘乘10，积也乘，积也乘10
4、。能举例说明你发现的能举例说明你发现的规律吗？规律吗？三、巩固提升三、巩固提升1. 先算出每组题中第先算出每组题中第1题的积，再写出下面题的积，再写出下面 两题的得数。两题的得数。 123 120312030 485 485048500850825450363603600240240024000400200200三三、巩固提升、巩固提升2、用积的变化规律填空。 1824 1812 186432 216 108 四、拓展延伸四、拓展延伸1、完成下列计算，并说说自己发现的规律。 1824 （182）（242） （182）（242） 积不变的规律：积不变的规律：一个因数乘几，另一个因数除以相同的数，
5、一个因数乘几，另一个因数除以相同的数，积不变。积不变。这堂课，你有什么收获？这堂课，你有什么收获？1. CLICK TO EDIT TITLE STYLE2. CLICK TO EDIT TITLE STYLE3. CLICK TO EDIT TITLE STYLE4. CLICK TO EDIT TITLE STYLEClick To Edit Title StyleClick To Type Slide TitlePictures speak 1,000 words!Design InspirationClarity & ImpactPremium DesignSubtle TouchVi
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