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单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,北师大版二年级数学下册,小小图书馆,学习目标:,1.使同学们能够熟练正确地计算三位数减法的算式。,2.能结合具体情况提出问题,并能运用所学知识解决一些简单的实际问题。,口 算,1612=,28,257=,18,30030=,270,30030=,330,4515=,60,7070=,0,70070=,630,189=,9,100+30=,130,10030=,70,257=,32,257=,18,6313=,50,7822=,100,9911=,110,用200、300、500这三个数写出两个加法算式和两个减法算式。,讨论:找回32元钱对不对?,用竖式计算并验算。,346284,831381,635319,猜一猜小红验算的是哪一道减法题。,验,算,9,9,6,4,3,2,5,6,4,讨论:30076,3,0,0,7,6,2,2,4,.,.,填 表,被减数,90,640,1120,140,减 数,30,500,58,差,800,70,62,40,80,60,1300,570,120,1080,60,加 数,38,25,48,72,加 数,24,36,55,和,63,95,100,55,89,62,38,47,64,0,17,
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