三年级数学下册六《认识分数》吃西瓜课课练北师大版.doc

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1吃西瓜一、填一填。1.3个 加上2个 是( )个 ,就是( ) 。19 19 192. 计算1 时,想:1( ) ,也就是( )个 减( )个 ,还剩( )个 ,211 111 111 111就是( ) 。二、看图计算。 14+2=( )48+3=( )三、计算。25+1= 7+2= 58+1=89+ = 4+ = 47+2=四、一根木料长 米,锯成三段后,第一段长 米,第二段比第一段长 米,第三段910 310 110长多少米?参考答案2一、1.5 592. 11 2 9 1111 911二、 (1) (2)34 78三、 1 1 35 57 68 67四、

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