二年级数学下册7万以内数的认识整百、整千数加减法第11课时整百、整千数加减法(1)课件新人教版.ppt

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1、第11课时 整百、整千数加减法(1),1.口算。,4050 9060 9010 8050 6030 10070 2070 1090 6020,90,30,90,30,90,100,100,30,40,2. 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。,8,15,5,13,4,10,2,20,用加法计算:,100020003000 (元),10002000,1个千,2个千,3个千,3000,10002

2、000,123,10002000,3000,3000,试着算一算。,1个千加2个千是3个千,就是3000。,11,20001000,211,20001000,1000,1000,怎样想?,2个千减1个千是1个千,就是1000。,相加法:1000( )2000,1000,20001000,1000,用减法计算:,200010001000 (元),8050,130,13050,80,想加法:50( )130,13050,80,80,1500,900,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。,12,整百、整千数不进(退)位加减法的计算方法:可以根据数的组成把整百、整千数看成几个百、几个千的形式,然后相加减。还可以把末尾的0不看,只把0前面的数相加减,最后再在得数末尾添上与之相同个数的0即可。,(1)迎宾山庄和假日宾馆一共住了多少人?,1. 桂林山水美,喜迎天下人。,9006001500(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?,20006001400(人),7050 800900 12050 1700900,200400 30006000 600400 90003000,2.计算。,600,200,9000,6000,120,70,1700,800,

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