认识几百几十,苏教版二年级数学下册,教学目标,1.通过实际操作,理解几百几十的含义,能正确地进行读、写。 2.学会口算整百数加整十数及相应的减法,会估计一些常见事物的多少,发展估算意识和能力。,?,4个百,5个十,4个百和5个十合起来是四百五十,4,5,0,370,430,390,400,410,420,一十一十地数,从八百九十数到一千。,890,900,910,920,930,940,950,960,970,980,990,1000,( )( )( )( )( ),380,350,130,( )百和( )个十合起来是( ),3,5,13个十是(),300,220,750,580,320,320,300,20,200 50 250,50 200 250,250 200 50,250 50 200,700300= 700 30 =770700 = 77070= 540500 = 700300 = 300600= 30600=,1000,730,70,700,40,400,900,630,40020=420(棵),本课小结,本节课我们主要认识了几百几十数,同学们要能够准确的读写几百几十数,会口算整百数加减整十数。能够估算一些常见事物的多少。,