整十整百整千数加减法.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,整十、整百、整千数,加减法,万以内数的认识,1.,口算。,40,50,90,60,90,10,80,50,60,30,100,70,20,70,10,90,60,20,2.,填一填。,（,1,）,80,里面有（）个十；,150,里面有（）个十。,（,2,）,500,里面有（）个百；,1300,里面有（）个百。,（,3,）,4000,里面有（）个千；,10000,里面有（）个千。,（,4,）,2000,里面有（）个千，,2000,里面有（）个百。,一、复习导入，揭示课题,90,30,90,30,90,100,100,30,40,8,15,5,13,4,10,2,20,二、探究新知,用加法计算：,1000,2000,3000,（元）,1000,2000,1,个千,2,个千,3,个千,3000,1000,2000,1,2,3,1000,2000,3000,3000,1000,元,2000,元,1,个千加,2,个千是,3,个千，,就是,3000,。,二、探究新知,2000,1000,2,1,1,2000,1000,1000,1000,2,个千减,1,个千是,1,个千，就是,1000,。,用减法,计算：,2000,1000,1000,（元）,冰箱比电视贵多少钱？,1000,元,2000,元,900,600,1500,600,二、探究新知,80,50,130,130,50,80,想加法：,50,（）,130,130,50,80,80,1500,900,8,个十加,5,个十是,13,个十，就是,130,。,13,个十减,5,个十是,8,个十，就是,80,。,70,50,800,900,120,50,1700,900,200,400,3000,6000,600,400,9000,3000,1.,计算。,三、知识运用,600,200,9000,6000,120,70,1700,800,三、知识运用,2.,捉鼠竞赛。,4000,160,80,（,1,）迎宾山庄和假日宾馆一共住了多少人？,三、知识运用,3.,桂林山水美，喜迎天下人。,900,600,1500,（人）,（,3,）你还能提出哪些数学问题？你会解答吗？,（,2,）民俗度假村比假日宾馆多住了多少人？,2000,600,1400,（人）,三、知识运用,民俗度假村比迎宾山庄多住多少人？,2000-900=,1100,（人）,假日宾馆比迎宾山庄少住多少人？,900-600=,300,（人）,民俗度假村和迎宾山庄一共住了多少人？,2000+600=,2600,（人）,四、课堂作业,作业：,第,97,页练习十九，第,3,题。,第,98,页,练习十九,，第,4,题。,