二年级数学下册五《加与减》小蝌蚪的成长同步练习2北师大版.doc

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1小蝌蚪的成长 一、帮它们好吗? 学生先四人小组讨论、估算,说说为什么? 独立算验证,汇报时说算理。二、算一算,填一填。副食店运来 410 千克鸡蛋,上午卖出 152 千克,下午卖出 174 千克,还剩多少千克?三、填入正确的答案,(1)14589( )。A56 66 C234 D144(2)345=233+( )A122 B111 C112 D102(3)345+211=( )A556 B555 C566 D5762参考答案:一、帮它们好吗?二、算一算,填一填。410-152=258258-174=84三、入正确的答案,(1)A(2)C(3)A3

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