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因数与倍数,THE PROFESSIONNAL BUSINESS TEMPALTE,老师:,XXX,因数与倍数THE PROFESSIONNAL BUSINES,1,目 录,CONTENTS,01,一、复习导入,揭示课题,02,二、探究新知,03,三、知识运用,04,四、布置作业,目 录CONTENTS01一、复习导入,揭示课题02二、探究,2,复习导入,揭示课题,1,复习导入,揭示课题1,3,63,9,19,7,21,21,26,8,20,10,2,3,30,6,9,5,12,2,7,2,.,71,5,1,3,.,25,1,.,8,2,0,.,6,6,计算下面各题,。,这道题请你保留两位小数。,6391972121268201023,4,探究新知,2,探究新知2,5,63,9,19,7,21,21,26,8,20,10,2,3,30,6,9,5,12,2,7,2,.,71,5,1,3,.,25,1,.,8,2,0,.,6,6,观察这些算式,把它们分分类。,6391972121268201023,第一类,12,2,6,21,21,1,20,10,2,63,9,7,30,6,5,我们分成了这样的两类,第一类中所有算式的商都是整数,第二类中所有算式的商都是小数。,第二类,9,5,1,.,8,26,8,3,.,25,19,7,2,.,71,2,3,0,.,6,第一类1226212112010263973,第二类,9,5,1,.,8,26,8,3,.,25,19,7,2,.,71,2,3,0,.,6,第一类,12,2,6,21,21,1,20,10,2,63,9,7,30,6,5,在整数除法中,如果商是整数而没有余数,我们就说被除数是除数和商的,倍数,,除数和商是被除数的,因数,。例如,,12,2,6,,,12,是,2,和,6,的倍数,,2,和,6,是,12,的因数。,第二类951.82683.251972.712,21,21,1,21,是,21,和,1,的倍数,,21,和,1,是,21,的因数。,20,10,2,20,是,10,和,2,的倍数,,10,和,2,是,20,的因数。,第一类,12,2,6,21,21,1,20,10,2,63,9,7,30,6,5,第二类,9,5,1,.,8,26,8,3,.,25,19,7,2,.,71,2,3,0,.,6,21211,21是21和1的倍数,21和1是21的因数。,30,6,5,30,是,6,和,5,的倍数,,6,和,5,是,30,的因数。,63,9,7,63,是,9,和,7,的倍数,,9,和,7,是,63,的因数。,第二类,9,5,1,.,8,26,8,3,.,25,19,7,2,.,71,2,3,0,.,6,第一类,12,2,6,21,21,1,20,10,2,63,9,7,30,6,5,3065,30是6和5的倍数,6和5是30的因数。63,必须要说谁是谁的倍数,谁是谁的因数。,你发现了什么?,对,因数与倍数是相互依存的。,第一类,12,2,6,21,21,1,20,10,2,63,9,7,30,6,5,第二类,9,5,1,.,8,26,8,3,.,25,19,7,2,.,71,2,3,0,.,6,必须要说谁是谁的倍数,谁是谁的因数。你发现了什么?对,因数与,知识运用,3,知识运用3,12,下面的四组中,谁是谁的因数?谁是谁的倍数?,4,和,24,26,和,13,75,和,25,81,和,9,26,13,2,,商是整数没有余数,所以,13,是,26,的因数,,26,是,13,的倍数。,81,9,9,,商是整数没有余数,所以,9,是,81,的因数,,81,是,9,的倍数。,下面的四组中,谁是谁的因数?谁是谁的倍数?4和2426和13,布置作业,4,布置作业4,14,THANK YOU,POWERPOINT,THE PROFESSIONNAL BUSINESS TEMPALTE,THANK YOUPOWERPOINTTHE PROFESS,15,
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