三年级数学下册六《认识分数》比大小课课练北师大版.doc

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1比大小一、涂一涂,比一比,填一填。( ) ( ) 25 35 15 18我们发现 :分母相同,分子大的分数比较( ) ;分子是1的分数,分母大的分数比较( ) 。二、判断。(1) 千克铁比 千克棉花重。 ( )(2)分母相同的分数,分子大的分数值也大。 ( )(3)1 可以写成无数个分子和分母相同的分数。 ( )(4) 比 1 大。 ( )(5)一张长方形纸的 和一张正方形纸的 大小相等。 ( )%三、选择。(1)和“1”相等的分数是( ) 。A. 2B. 4C. 98 (2)与 相等的分数有( )个。A.1 B.2 C.无数:(3)在 18、 9和 0这三个分数中,最大的是( ) 。A. B. C. 1四、小军带了20 元钱去文具店买学习用品,买一支钢笔用了总数的 ,买一个日记本12用了总钱数的 ,钢笔和日记本哪个贵一些?贵多少元钱?152参考答案一、 大 小(涂色略)二、 (1) (2) (3) (4) (5)三、 (1)C (2)C (3)A四、钢笔贵一些,贵6 元。提示:一支钢笔的价钱是总钱数的 ,即一半,所以一支钢笔是202 10(元)钱;12一个日记本的价钱是总钱数的 ,就是把20 元钱平均分成5份,买它要用其中的1 份,即15205 4(元)钱。所以钢笔比日记本贵10 4 6(元)钱。

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