1、西师大版二年级数学下册,重庆市云阳县 冉崇兵,整十、整百的加减1,上海到武汉与重庆到武汉比, 哪段路近?,342+760,652+626,270+297,买三等舱的1张上铺 票和1张下铺票,一 共要多少元?,270+297,解决这些问题,要用到 三位数加三位数。,整十、整百的加减1,两种气球一共有多少个?,8袋经气球, 5袋黄气球。,每袋10个。,80 + 50 = (个),8 个 十,5 个 十,13 个 十,+,=,130,答:两种球一共有130个。,两种气球一共有多少个?,8袋经气球, 5袋黄气球。,每袋10个。,80 + 50 = (个),从80往后数 5个十,90,100,110,1
2、20,130,130,答:两种球一共有130个。,红气球比黄气球多少个?,8袋经气球, 5袋黄气球。,每袋10个。,80 - 50 = (个),8 个 十,5 个 十,3 个 十,+,=,30,答:红气球比黄气球多30个。,红气球比黄气球多少个?,8袋经气球, 5袋黄气球。,每袋10个。,从80往前数 5个十,80 - 50 = (个),70,60,50,40,30,30,答:红气球比黄气球多30个。,1200,300 + 900 =,200,900 - 700 =,?个,看图填空。,苹果300个,苹果50个,300 + 50 = (个),350,看图填空。,苹果50个,350个,?个,- 5
3、0 = (个),300,350,看图填空。,苹果300个,350个,?个,- 300 = (个),50,350,30,400,400,30,430,300 + 50 =,430 - =,430 - =,1、看图填算式。,=,=,=,300,+,200,500,500,-,300,200,500,-,200,300,2、填空。,0,10,20,30,=,20 +,30,50,50,2、填空。,0,400,500,300,=,400 -,300,100,100,3、口算。,20+50=,70-40=,300+700=,200+500=,700-400=,900+700=,200+50=,750-700=,900+70=,20+500=,750-50=,90+700=,70,30,1000,700,300,1600,250,50,970,520,700,790,400+300,=700,700-400,=300,700-300,=400,4、看图写算式。,加法算式:,减法算式:,5、根据加法算式填空。,80+60=( ),( )-60=( ),( )-80=( ),300+600=( ),( )-600=( ),( )-300=( ),140,140,80,140,60,900,900,300,900,600,