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万以内数的加法

万以内数的加法. 1、 口算: 5 0 +40=   70 + 20 =   46 + 10 =  300 + 180 =  650+110 =  10 0 +90= . 9 0. 9 0. 56. 480. 760. 190. 1、 口算: 5 0 +40=   36+40 =   70 + 20 =   55 + 30 =  46 + 10 =  70 + 5 0=  300 + 180 =  170 + 30 =  650+110 =  400+360 = 

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万以内数的加法

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  1. 万以内数的加法

  2. 1、口算: 50+40=   70+20=   46+10=  300+180=  650+110=  100+90=  90 90 56 480 760 190

  3. 1、口算: 50+40=   36+40=   70+20=   55+30=  46+10=  70+50=  300+180=  170+30=  650+110=  400+360=  100+90=  250+350=  90 76 85 90 56 120 480 200 760 760 190 600

  4. 1、口算: 50+40=   36+40=   80+70=    70+20=   55+30= 90+50=   46+10=  70+50= 60+40=   300+180=  170+30=  490+210= 650+110=  400+360=  270+230=   100+90=  250+350=  600+200=   90 76 150 140 85 90 56 120 100 480 200 700 760 760 500 190 600 800

  5. 2、用竖式计算: 170+120= 340+470=

  6. 列竖式计算。 919+80 476+121

  7. 想一想: 271+903,怎样计算?

  8. 竖式计算: 365+825= 719+252=

  9. 计算万以内的加法要注意什么? 1、相同数位要对齐: 2、从个位加起; 3、哪一位上的数相加满十,就要向前一位进“1”。

  10. 做一做: 93+802= 545+54= 281+64= 65+93=

  11. 145 + 64 209 725 + 543 1268 下面的计算正确吗?把错误的改正过来。 145 + 64 785 725 + 543 268 (×) (×) 1

  12. 作业: 1、列竖式计算: 365+43=   201+594= 638+93=   697+235= 475+126=  532+407= 2、图书室有故事书374书本,科技书216 本,两种书一共有多少本?

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