万以内数的认识 整十、整百、整千数的加减法

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1、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；,100

2、00,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,试着算一算。,1,个千加,2,个千是,3,个千，,,就是,3000,。,

3、,,二、探究新知,2000,－,1000,＝,2,－,1,＝,1,2000,－,1000,＝,1000,1000,怎样算？,2,个千减,1,个千是,1,个千，就是,1000,。,,想加法,：,1000,＋（ ）＝,2000,1000,2000,－,1000,＝,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,

4、1500,900,怎样想？,试一试。,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,600,200,9000,6000,120,70,1700,800,500,＋,1000,5000,－,4000,400,＋,500,三、知识运用,2.,捉鼠竞赛。,4000,160,80,1800,－,900,120

5、0,－,300,1900,－,1000,100,＋,900,1700,－,700,400,＋,600,800,＋,700,2500,－,1000,3000,－,1500,90,＋,70,160,－,80,9000,－,5000,三、知识运用,3.,小猴送信。,,,三、知识运用,,,750,＋,30,＝,1300,＋,1000,＝,540,＋,260,＝,4200,＋,300,＝,6300,＋,500,＝,4600,＋,400,＝,750,－,30,＝,1300,－,1000,＝,540,－,260,＝,4200,－,300,＝,6300,－,500,＝,4600,－,400,＝,4.,算一算，并说一说你是怎样算出来的。,780,2300,800,4500,6800,5000,720,300,280,3900,5800,4200,（,1,）迎宾山庄和假日宾馆一共住了多少人？,三、知识运用,4.,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）,四、课堂作业,作业：,第,97,页练习十九，第,3,题。,