五年级数学下册第2章校园艺术节—分数的意义和性质信息窗1第1课时分数的意义课件青岛版六三制.ppt

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从图中,你了解到哪些数学信息?,根据这些信息,你能提出什么问题?,把1块红色橡皮泥平均分给4人,每人分得这块橡皮泥的几分之几?,把一块橡皮泥,平均分成4份,,把4块黑色橡皮泥平均分给4人,每人分得这些橡皮泥的几分之几?,把四块黑橡皮泥看作一个整体,,平均分成4份,,只要把一个整体平均分成4份,,每份就是这个整体的,想一想:2份是这个整体的几分之几?3份呢?4份呢?,把4张黄色纸平均分给2人,每人分得这些纸的几分之几?把6张绿色纸平均分给3人呢?,1,2,1,3,一个物体、一个计量单位或由许多物体组成的一个整体,都可以用自然数1来表示,通常我们把它叫作单位“1”。,用分数表示涂红色的部分,并说说什么是分数。,1 6,2 3,3 4,2 5,1.填一填。,用分数表示是( ),它里面有( )个( ) 。,1,用分数表示是( ),它里面有( )个( )。,7,2.分一分,涂一涂。,这节课你有哪 些收获?,作业,请完成教材第12页自主练习,第3、6题。,xx小学 x年级x班,xxx,

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