Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,11/7/2009,#,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,*,整百、整千数加减法,1(1)13个十是多少?,(2)25个百是多少?,(3)5个千呢?,(4)80里面有()个十,2700里面有()个百,130里面有()个十,4000里面有()个千,130,2500,5000,8,7,13,4,400,300,3,想:4个百加3个百是7个百,700,700,300,400,2000,6000,8000,9000,4000,5000,9个千减去4个千等于5个千,200,30,230,30,230,200,练一练,4,200,30,2个百加上3个十等于2个百3个十,也就是230,230,返 回,200,230,30,200,30,返 回,30,230,200,200,30,返 回,练一练,200400=30006000=90007000=,45050=45004000=3400400=,80,50,130,50,130,80,8个十加5个十是13个十就是130,130,因为8050等于130,所以130减去80就等于50,80,因为8050等于130,所以130减去50就等于80,50,900 600,1500 600,1500,900,5,中央电教馆资源中心制作,2004.03,