二年级数学下册五《加与减》买电器同步练习北师大版.doc

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1、1买电器 1.口算:看谁算的又对又快670300= 460200= 1800200= 1800200= 380200= 1000800=300+700= 1600-700=200+400= 2800-300=300+500+800= 400+600+900=2 数学游戏:你说我算。(1)两个数的和是 1000( )( )=1000(2)两个数的差是 400( )( )=400(3)两个数的差是 200( )( )=200(4)两个数的和是 800( )( )=8003、爸爸妈妈出门买电器,电视机消费了 800 元,冰箱消费了 2000,冰箱比电视机贵多少钱?参考答案:1、 口算:看谁算的又对又

2、快670300=970 460200= 660 21800200=2000 1800200= 1600 380200= 180 1000800=200300+700=1000 1600-700=900200+400=600 2800-300=2500300+500+800=1600 400+600+900=19002、数学游戏:你说我算。(1)两个数的和是 1000( 500 )( 500 )=1000(2)两个数的差是 400( 600 )( 200 )=400(3)两个数的差是 200( 400 )( 200 )=200(4)两个数的和是 800( 400 )( 400 )=8003、冰箱比电视机贵 2000-800=1200

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