三年级数学下册6.2《分一分(二)》课件2北师大版.ppt

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分蛋糕,爸爸吃的这三块是整个蛋糕的,( ),( ),小明吃的这两块 是整个蛋糕的,( ),( ),3,6,6,1,6,2,妈妈吃的这一块是 整个蛋糕的,( ),( ),把正方形中的小方块涂上红、黄、蓝三种颜色,2,4,3,表一,2,4,3,表二,比一比,(1)蝴蝶总数是( )只,(2)白蝴蝶只数占所有蝴蝶的,(3)花蝴蝶只数占所有蝴蝶的,3,7,4,7,7,(4)图中还有什么可以用分数表示?与同伴说一说。,观察下图,你能得到哪些分数?,1.,涂一涂,填一填。 把图中的2个三角形涂上红色,占图形的 ; 3个三角形涂上黄色,占图形的 ; 3个三角形涂上蓝色,占图形的 。,每种颜色的小三角形分别占8个小三角形的几分之几?与同伴说一说。,2 8,3 8,3 8,2.观察下图,你能得到哪些分数?与同伴说一说。,第一排,第二排,第三排,第四排,第五排,3.圈一圈,说一说。,4.圈起来的占总数的几分之几?,1,2,4,5.按分数圈一圈。,6.12位小朋友拍合影照。,男生占全部小朋友的 。 在这幅照片中,有 的小朋友梳小辫。,4 12,2 12,7.钟表上的分数。你能用分数把图中的阴影部分表示出来吗?,

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