五年级数学下册第2章因数与倍数1因数与倍数例2课件新人教版.ppt

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口算下面各题,说说谁是谁的倍数? 谁是谁的因数?,342,24,186,17,0.5,3,18的因数有哪几个?,18118,1829,1836,18的因数有:1,2,3,6,9,18。,18的因数有哪几个?,3,6,9,18,18的因数有哪几个?,30的因数有哪些?36呢?,30130,30215,30310,30的因数有:1,2,3,5,6,10,15,30。,3056,36136,36218,36312,36的因数有:1,2,3,4,6,9,12,18,36。,3649,3666,像3666这样除数和商都是6,只写一个。,归纳总结:1.找一个数的因数的方法:用这个数除以一个整数,如果除得的商正好是整数且没有余数,那么这个整数就是这个数的因数。 2.一个数的因数的表示方法:(1)列举法。(2)集合法。 3.一个数的因数的特征:一个数的因数的个数是有限的,其中最小的因数是1,最大的因数是它本身。,写出下面各数的因数。,10 17 28 32 48,10的因数有:1,2,5,10。,17的因数有:1,17。,28的因数有:1,2,4,7,14,28。,32的因数有:1,2,4,8,16,32。,48的因数有:1,2,4,6,8,12,24,48。,作业,请完成教材练习二,第6题。,xx小学 x年级x班,xxx,

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