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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,绿色圃中小学教育网http:/,*,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,绿色圃中小学教育网http:/,*,因数和倍数,义务教育教科书人教版数学五年级下册,因数和倍数义务教育教科书人教版数学五年级下册,12,2=6,9,5=1.8,30,6=5,2,3,0.67,26,8=3.25,19,7,2.71,20,10=2,21,21=1,63,9=7,122=6 95=1.8 3,12,2=6,9,5=1.8,30,6=5,2,3,0.67,26,8=3.25,63,9=7,20,10=2,21,21=1,19,7,2.71,第一类,第二类,122=6 95=1.8 306=5230,第一类,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,。,12,2=6,63,9=7,21,21=1,30,6=5,第一类 在整数除法中,如果商是整数而没有余数,我们就,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。,12,2=6,12,是,2,和,6,的倍数,2,和,6,是,12,的因数,12,是,2,的倍数,12,是,6,的倍数,2,是,12,的因数,6,是,12,的因数,在整数除法中,如果商是整数而没有余数,我们就说,被,63,9=7,639=7,12,2=6,63,9=7,21,21=1,30,6=5,122=6639=7 212,12,2=6,63,9=7,21,21=1,30,6=5,c,b=a,c,是,a,和,b,的倍数,,a,和,b,是,c,的因数。,为了方便,在研究因数和倍数的时候,我们所说的数指的是自然数(一般不包括,0,),。,(,a,b,c,是非,0,自然数),122=6639=7 212,因为,6,2=3,,,所以,6,是,2,的倍数,,2,是,6,的因数。,6,和,2,因为62=3,6和2,24,是,6,的倍数,6,是,24,的因数,6,和,24,6和24,6,和,2,6,和,24,因数和倍数是相互依存的。,6,是,2,的倍数,6,是,24,的因数,6和26和24因数和倍数是相互依存的。6是2的倍数6是24的,18,的因数有哪几个?,18,(),=,(),18,1=18,18,2=9,18,3=6,18,4,18,5,18,6=3,18,9=2,18,18=1,18,6=3,18,9=2,18,18=1,18,的因数有:,_,_,_,_,_,_,。,1,3,2,6,9,18,18的因数有哪几个?18()=()181=18,18,的因数有:,1,,,2,,,3,,,6,,,9,,,18,。,18,的因数有哪几个?,18,的因,数,1,,,2,,,3,6,,,9,,,18,18的因数有:1,2,3,6,9,18。18的因数有哪几个?,一个数的最小的因数是,1,,,一个数的最小的因数是1,,一个数的最小的因数是,1,,,一个数的因数的个数是有限的。,最大的因数是它本身。,一个数的最小的因数是1,一个数的因数的个数是有限的。最大的因,2,,,3,,,5,7,,,11,,,13,,,17,,,19,,,23,,,29,4,,,6,,,8,9,,,10,,,12,,,14,,,15,,,16,,,18,,,20,,,21,,,22,,,24,,,25,,,26,,,27,,,28,,,30,因数的个数有,2,个,因数的个数,2,个以上,只有,1,个因数:,1,2,3,5,7,4,6,8,9,10,12,14,因,2,,,3,,,5,7,,,11,,,13,,,17,,,19,,,23,,,29,4,,,6,,,8,9,,,10,,,12,,,14,,,15,,,16,,,18,,,20,,,21,,,22,,,24,,,25,,,26,,,27,,,28,,,30,因数的个数有,2,个,因数的个数,2,个以上,只有,1,个因数:,1,2,3,5,7,4,6,8,9,10,12,14,因,2,,,3,,,5,7,,,11,,,13,,,17,,,19,,,23,,,29,4,,,6,,,8,9,,,10,,,12,,,14,,,15,,,16,,,18,,,20,,,21,,,22,,,24,,,25,,,26,,,27,,,28,,,30,因数的个数有,2,个,因数的个数,2,个以上,只有,1,个因数,:,1,2,3,5,7,4,6,8,9,10,12,14,因,把中间符合条件的数填入相应的热气球里。,1 2 3 4 5 6 8 9 10 12 15 16 18 20 24 30 36 60,36,的因数,60,的因数,1,2,3,4,6,9,12,18,36.,1,2,3,4,5,6,10,12,15,20,30,60.,1,2,3,4,6,9,12,18,36.,1,2,3,4,5,6,10,12,15,20,30,60.,第一站,把中间符合条件的数填入相应的热气球里。1 2 3,下列的说法正确吗?,正确的请在括号里画“”,错误画“,X,”。,(,1,),1,是,1,,,2,,,3,,,的因数。,(),(,2,),369=4,,所以,36,是,9,的因数,。(,),(,3,),5.7,是,3,的倍数。,(),X,第二站,X,下列的说法正确吗?(1)1是1,2,3,的因数。,新人教版小学五年级下册数学因数和倍数ppt课件,每天努力一点点,每天进步一点点,每天努力一点点,
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