五年级数学下册第4章分数的意义和性质第3课时真分数与假分数课件新人教版.ppt

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1、1.把单位“1”平均分成若干份,表示其中的一份或几份的数叫做( )。,分数,2.把单位“1”平均分成若干份,表示其中的一份或几份的数叫做( )。,分数单位,填一填!,你能用分数表示图中涂色部分并说出它的意义吗?,说一说!,分别涂色表示下面的分数,并说说把什么看作单位“1”。,的分数单位是 ,它有1个这样的分数单位。,的分数单位是 ,它有3个这样的分数单位。,的分数单位是 ,它有5个这样的分数单位。,把1个圆作为单位“1”。,(1)4个 是多少?在下图中涂一涂。,把1个圆看作单位“1”。,把1个圆看作单位“1”。,观察这两个假分数,你有什么发现?,可以看做 (也就是1)和 合成的数。写作: 读作

2、一又四分之三。,可以看做 (也就是2)和 合成的数。写作: 读作:二又五分之一。,(1)把 、 化成整数。,(1)把 、 化成整数。,(1)把 、 化成带分数。,怎样化成带分数?,真分数和假分数,1.分子比分母小的分数叫做真分数。真分数都小于1.,2.分子比分母大或者分子和分母相等的分数叫做假分数。假分数大于1或等于1.,3.假分数可以化成整数或者带分数。,在下面的分数中哪些是真分数?哪些是假分数?在直线上表示出来。,.,.,.,.,.,.,.,1. 把下面的假分数化成带分数或整数。,1.把下面的假分数化成带分数或整数。,2.花坛里有月季花32朵,菊花47朵。月季花是菊花的几分之几?菊花是月季花的几分之几?,答:月季花是菊花的 ,是月季花的 。,要使 是真分数,同时使 是假分数, 可能是几?,要使 是真分数,同时使 是假分数, 可能是几?,4,5,6,7,8,9,10,1,2,3,4,5,6,7,1.分子比分母小的分数叫做真分数。真分数都小于1.,2.分子比分母大或者分子和分母相等的分数叫做假分数。假分数大于1或等于1.,3.假分数可以化成整数或者带分数。,课本第55页练习十三第1,2,3题。,xx小学 x年级x班,xxx,

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