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1、,,,,,,整十?dāng)?shù)加、減整十?dāng)?shù)練習(xí)課,,,,,,引入,,,,,,,,,,,,,,,,,,,,,,,口算:,,,27 85 488 2070 8050 7030 3070 399 370 10030,9,90,3,30,40,40,100,73,30,70,新授,探究一,探究二,,,,,,,,,,,,探究一:,,,,,,,,,,,,探究一,探究二,,,,,,,,,,,,探究一,探究二,探究一:,,,,,,,,,,,,探究一,一共有幾盒墨水?,426(盒),或246(盒),探究二,,,,,,,,,,,,探究一,一共有幾瓶墨水?,402060(瓶),或204060(瓶),探究一:,探究二
2、,,,,,,,,,,,,探究一,,一共有6盒墨水,左邊有4盒,右邊有幾盒?,642(盒),一共有6盒墨水,右邊有2盒,左邊有幾盒?,624(盒),探究一:,探究二,,,,,,,,,,,,探究一,,一共有60瓶墨水,左邊有40瓶,右邊有幾瓶?,604020(瓶),一共有60瓶墨水,右邊有20瓶,左邊有幾瓶?,602040(瓶),探究一:,探究二,,,,,,,,,,,,探究一,,426(盒),246(盒),402060(瓶),204060(瓶),642(盒),624(盒),604020(瓶),602040(瓶),探究一:,這兩組算式有什么小秘密?,探究二,,,,,,,,,,,,探究一,,試一試:看
3、圖列出兩個(gè)加法和兩個(gè)減法算式。,,,40242,24042,42240,42402,403070,304070,703040,704030,探究一:,探究二,,,,,,,,,,,,,探究一,,探究二:,停車(chē)場(chǎng)原來(lái)停著20輛車(chē),開(kāi)來(lái)了10輛,又開(kāi)來(lái)30輛。,現(xiàn)在有幾輛車(chē)?,20103060(輛),探究二,,,,,,,,,,,,,探究一,,探究二:,停車(chē)場(chǎng)原來(lái)停著60輛車(chē),開(kāi)走了10輛,又開(kāi)走30輛。,現(xiàn)在還剩幾輛車(chē)?,60103020(輛),探究二,,,,,,,,,,,,,探究一,,探究二:,停車(chē)場(chǎng)原來(lái)停著60輛車(chē),開(kāi)走了10輛,又開(kāi)來(lái)了20輛。,601000(輛),現(xiàn)在有幾輛車(chē)?,探究二,,,
4、,,,,,,,,,探究一,,探究二:,20103060(輛),60103030(輛),601000(輛),連加、連減、加減混合運(yùn)算,按從左往右的順序進(jìn)行計(jì)算。,探究二,練習(xí),練習(xí)一,練習(xí)二,練習(xí)三,,,,,,,,,,,,107 540 1070 4050 35142= 3005401020= 30050 401020=,,,,,,,,,,,,練習(xí)一:,1. 口答。,17,80,45,90,9,45,70,7,70,練習(xí)一,30,練習(xí)二,練習(xí)三,,,,,,,,,,,,練習(xí)二:,練習(xí)一,30,6,38,59,88, 80, 87, 35, 80, 10,練習(xí)二,練習(xí)三,1.,,,,,,,,
5、,,,,練習(xí)二:,2.,練習(xí)一,4030 9050 10080 955 8080 606 4020880504 405030= 906010,70,90,40,0,20,66,68,60,34,20,練習(xí)二,練習(xí)三,練習(xí)二:,,,,,,,,,,,,練習(xí)一,3.小圖書(shū)室有90本故事書(shū)。 借出40本,還剩多少本?,904050(本),練習(xí)二,練習(xí)三,2040 8070 2050 8060 2060 8050 2070 8040,練習(xí)三:,,,,,,,,,,,,想一想,算一算。,練習(xí)一,60,70,80,90,10,20,30,40,練習(xí)二,練習(xí)三,小結(jié):,,,,,,,,,,,,小結(jié):,,,,,,,,,,,,在計(jì)算時(shí)要看清數(shù)字和符號(hào)。計(jì)算連加、連減、加減混合運(yùn)算時(shí),按從左到右的順序進(jìn)行計(jì)算。,作業(yè):,,,,,,,,,,,,