三年级数学下册五《面积》面积单位的换算同步练习(二)北师大版.doc

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1面积单位的换算 一、填空题1. 在下面的图形中,按分数涂上颜色。2. 用分数表示下面每个图里的涂色部分。3. 把这块月饼平均分成四块,每块是它的( )分之一,写作( )。*4. 一块菜地的 83种了白菜,其余的种萝卜,萝卜占这块地的 ( )( )。5. 一正方形的纸对折一次,每份是这纸的 ( )( ),对折 3 次每份是这张纸的 ( )( )。6. “一箱苹果吃去了 43”,这是把一箱苹果平均分成了( )份,吃去的苹果有这样的( )份,由此可以推出剩下这箱苹果的 ( )( )。二、判断题1. 用一张正方形纸折出 21,只有一种折法。 ( )*22. 6 枝铅笔的 21和 4 枝铅笔的 21相等。 3. 一张纸对折的次数越多,一份就越小。 4. 分母相同表示平均分的份数相同。 三、看图列算式答案一、1. 略2. 1/12 5/12 1/2 4/9 3/83. 四 1/44. 5/85. 1/2 1/86. 4 37. 1/4二、错对对对三、7/8 5/6 1 3/8( )( )( )3

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