西师大版二年级数学下册,整十、整百数的加减,学习目标:1. 学会计算整十、整百数的加减法。2. 能够熟练正确地进行计算。,(1)两种气球一共有多少个?(2)红气球比黄气球多多少个?,80+50( )(个) 80-50( )(个),答:两种气球一共有130个,红气球比黄气球多30个。,130,30,牛刀小试,300+900 900-700 ,1200,200,300 + 50 ( )(个)( )- 50 ( )(个)( )- 300( )(个),350,350,300,350,50,再显身手,300 + 400 ( )700 - ( )( )700 - ( )( ),700,300,400,400,300,看图写算式。加法算式:_减法算式:_,开火车,20+50200+500200+5020+500,70,700,250,520,70-40=700-400=750-700=750-50=,30,300,50,700,60+60=100-30=600-500=260-40=400+400=30+800=,120,70,100,220,800,830,分享快乐谢谢大家,