二年级数学下册五《加与减》小小图书馆同步精练北师大版.doc

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1、1小小图书馆一、我是聪明的小法官。1. 三位数减两位数,差一定是三位数。 ( )2. 验算减法时,只能用减法进行验算。 ( )3. 加法和减法都可以用来验算加法。 ( )4. 在用竖式计算三位数的减法时,要从个位减起。 ( )5.425 169 的差是 366。 ( )二、竖式计算并验算。 674142=验算:963341=验算: 3、小猴摘桃2四、啄木鸟。8 93 改正: 50 0 改正:3 7 6 2 4 7- -5 2 7 3 5 39 6 4 改正: 3 5 3 改正:8 6 2 1 61 7- -1 0 4 6 2 05、生活小管家。1.小男孩比爸爸矮多少厘米?75962850929

2、980798900583687528709131210159317我的身高是180 厘米。我的身高是138 厘米。3原价:600元 原价:328元现价:469元 现价:199元(1)豆浆机和饮水机各降价多少元?(2)哪种商品降价比较多?多多少元?3. 帮助小区物业叔叔完成下表。户名 上月读数 本月读数 实用电量张涛 637 851 ( )度王进 324 705 ( )度李磊 564 800 ( )度(1)算出每户用的电费度数,并填入表格中。(2)用得最多的比用得最少的多用多少度电?4参考答案一、1.。2.。3. 。4. 。5.。二、532 622 验算略 三、四、五、1. 180 138 42(厘米) 。2.(1)600 469 131(元) ,328 199 129(元) 。(2)131 129 2(元) ,所以豆浆机降价比较多。3.(1)851 637 214(度) ,705 324 381(度) ,800 564 236(度) 。请同学们把这三个结果分别填入表内。(2)张涛家用得最少,王进家用的最多,381 214 167(度) 。5

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