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单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,#,第,2,课时 因数和倍数（,2,）,第,2,单元 因数与倍数,第2课时 因数和倍数（2）第2单元 因数与倍数,1,创设自主探索的学习情境，使学生在合作交流等过程中，让学生学会找不同数字的因数和倍数。,学习目标,创设自主探索的学习情境，使学生在合作交流等过程中，让,2,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,口算下面各题，说说谁是谁的倍数？谁是谁的因数？,342,24,34217,，商是整数没有余数，所以,34,是,2,和,17,的倍数，,2,和,17,是,34,的因数。,17,复习导入,24,0.5,，,商是小数不是整数，没有因数和倍数的关系。,0.5,状元成才路状元成才路状元成才路状元成才路状元成才路状元成才路,3,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,18,的因数有哪几个？,18,除以哪些整数的结果是整数？,18118,18,2,9,18,3,6,18,的因数有 ，,，。,1,2,3,6,9,18,探究新知,五年级下册数学课件,-,第二单元第,2,课时 因数和倍数（,2,）人教版,(,共,17,张,PPT),五年级下册数学课件,-,第二单元第,2,课时 因数和倍数（,2,）人教版,(,共,17,张,PPT),状元成才路状元成才路状元成才路状元成才路状元成才路状元成才路,4,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,18,的因数有哪几个？,哪两个整数相乘的积是,18,？,11818,29,18,36,18,1,，,2,，,_,，,_,，,_,，,_,。,18,的因数,3,6,9,18,探究新知,五年级下册数学课件,-,第二单元第,2,课时 因数和倍数（,2,）人教版,(,共,17,张,PPT),五年级下册数学课件,-,第二单元第,2,课时 因数和倍数（,2,）人教版,(,共,17,张,PPT),状元成才路状元成才路状元成才路状元成才路状元成才路状元成才路,5,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,36136,36218,36312,3649,3666,30,的因数有哪些？,36,呢？,30,的因数有：,1,，,2,，,3,，,5,，,6,，,10,，,15,，,30,。,301,30,30215,30310,3056,36的因数有：1，2，3，4，6，9，12，18，36。,像,366,6,这样除数和商都是,6,，只写一个。,探究新知,五年级下册数学课件,-,第二单元第,2,课时 因数和倍数（,2,）人教版,(,共,17,张,PPT),五年级下册数学课件,-,第二单元第,2,课时 因数和倍数（,2,）人教版,(,共,17,张,PPT),状元成才路状元成才路状元成才路状元成才路状元成才路状元成才路,6,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,30的因数有：1，2，3，5，6，10，15，30。,36的因数有：1，2，3，4，6，9，12，18，36。,18,的因数有：,1,，,2,，,3,，,6,，,9,，,18,。,18,的最小因数是（），最大因数是（）,30,的最小因数是（），最大因数是（）,36,的最小因数是（），最大因数是（）,1,18,1,30,1,36,你发现了什么？,探究新知,五年级下册数学课件,-,第二单元第,2,课时 因数和倍数（,2,）人教版,(,共,17,张,PPT),五年级下册数学课件,-,第二单元第,2,课时 因数和倍数（,2,）人教版,(,共,17,张,PPT),状元成才路状元成才路状元成才路状元成才路状元成才路状元成才路,7,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,一个数最小的因数是（），最大的因数是（）。,因数是成对出现的，所以一般都是双数个，但是像,4,，,9,，,16,，,这样的数除外。,1,它本身,探究新知,五年级下册数学课件,-,第二单元第,2,课时 因数和倍数（,2,）人教版,(,共,17,张,PPT),五年级下册数学课件,-,第二单元第,2,课时 因数和倍数（,2,）人教版,(,共,17,张,PPT),状元成才路状元成才路状元成才路状元成才路状元成才路状元成才路,8,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,10 13 27 32,10,的因数有：,1,，,2,，,5,，,10,13的因数有：1，13,27的因数有：1，3，9，27,32的因数有：1，2，4，8，16，32,写出下面各数的因数。,基础练习,五年级下册数学课件,-,第二单元第,2,课时 因数和倍数（,2,）人教版,(,共,17,张,PPT),五年级下册数学课件,-,第二单元第,2,课时 因数和倍数（,2,）人教版,(,共,17,张,PPT),状元成才路状元成才路状元成才路状元成才路状元成才路状元成才路,9,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,2,的倍数有哪些？,我用,2,分别乘,1,、,2,、,3,求出,2,的倍数。,21,2,22,4,23,6,24,8,25,10,26,12,2,，,4,，,_,，,_,，,_,，,_,，,2,的倍数,6,8,10,12,探究新知,五年级下册数学课件,-,第二单元第,2,课时 因数和倍数（,2,）人教版,(,共,17,张,PPT),五年级下册数学课件,-,第二单元第,2,课时 因数和倍数（,2,）人教版,(,共,17,张,PPT),状元成才路状元成才路状元成才路状元成才路状元成才路状元成才路,10,5,的倍数有：,5,10,15,20,25,31,3,32,6,33,9,34,12,35,15,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,3,的倍数有哪些？,5,呢？,3,的倍数有：,3,6,9,12,15,51,5,52,10,53,15,54,20,55,25,探究新知,5的倍数有：5,10,15,20,25,31332,11,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,2,的倍数有：,2,，,4,，,6,，,3,的倍数有：,3,，,6,，,9,，,12,，,15,，,5,的倍数有：,5,，,10,，,15,，,20,，,25,，,在找倍数的过程中你发现了什么？,探究新知,状元成才路状元成才路状元成才路状元成才路状元成才路状元成才路,12,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,一个数最小的倍数是它本身，没有最大的倍数。,一个数的因数的个数是有限的，而倍数的个数是无限的。,探究新知,状元成才路状元成才路状元成才路状元成才路状元成才路状元成才路,13,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,圈出下列数中,8,的倍数。,2 6 8 18,24 36 48,27 32 72,40 54 144,基础练习,状元成才路状元成才路状元成才路状元成才路状元成才路状元成才路,14,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,写出各数的因数或倍数。,因数,倍数（写出,4,个）,8,4,19,6,28,10,32,12,48,13,1,2,4,8,1,19,1,2,4,7,14,28,1,2,4,8,16,32,1,2,3,4,6,8,12,16,24,48,4,8,12,16,6,12,18,24,10,20,30,40,12,24,36,48,13,26,39,52,基础练习,五年级下册数学课件,-,第二单元第,2,课时 因数和倍数（,2,）人教版,(,共,17,张,PPT),五年级下册数学课件,-,第二单元第,2,课时 因数和倍数（,2,）人教版,(,共,17,张,PPT),状元成才路状元成才路状元成才路状元成才路状元成才路状元成才路,15,这节课你有什么收获？还有什么疑问吗？,课堂小结,五年级下册数学课件,-,第二单元第,2,课时 因数和倍数（,2,）人教版,(,共,17,张,PPT),五年级下册数学课件,-,第二单元第,2,课时 因数和倍数（,2,）人教版,(,共,17,张,PPT),这节课你有什么收获？还有什么疑问吗？课堂小结五年级下册数学,16,谢 谢 观 看,！,五年级下册数学课件,-,第二单元第,2,课时 因数和倍数（,2,）人教版,(,共,17,张,PPT),五年级下册数学课件,-,第二单元第,2,课时 因数和倍数（,2,）人教版,(,共,17,张,PPT),谢 谢 观 看！五年级下册数学课件-第二单元第2课时 因数和,17,
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