整百整千数的加减法.ppt

,*,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,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（）个千,8,7,13,4,130,2500,5000,400,300,3,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,个千,200,30,4,230,30,230,200,230,200,30,200,30,2,个百加上,3,个十等于,2,个百,3,个十，也就是,230。,230,练一练,200,230,30,200,30,30,230,200,200,30,练一练,200400=30006000=,90007000=45050=,45004000=3400400=,80,50,5,130,50,130,80,8,个十加,5,个十是,13,个十就是,130。,130,因为,80,50,等于,130,，所以,130,减去,80,就等于,50,。,80,因为,80,50,等于,130,，所以,130,减去,50,就等于,80,。,50,900 600,1500 600,1500,900,练一练,7050 400600,800900 120,50,1000,600,1400,800,巩固练习,1,口算下面各题,2,接力赛看算得又对又快,900300 540300 2900800,20005000 640200 7200200,4300300 5200200 360360,