《2019春一年級數(shù)學下冊 6.1《整十數(shù)加、減整十數(shù)》練習課課件 (新版)新人教版.ppt》由會員分享,可在線閱讀,更多相關《2019春一年級數(shù)學下冊 6.1《整十數(shù)加、減整十數(shù)》練習課課件 (新版)新人教版.ppt(25頁珍藏版)》請在裝配圖網(wǎng)上搜索。
1、,,,,,,整十數(shù)加、減整十數(shù)練習課,,,,,,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、圖列出兩個加法和兩個減法算式。,,,40242,24042,42240,42402,403070,304070,703040,704030,探究一:,探究二,,,,,,,,,,,,,探究一,,探究二:,停車場原來停著20輛車,開來了10輛,又開來30輛。,現(xiàn)在有幾輛車?,20103060(輛),探究二,,,,,,,,,,,,,探究一,,探究二:,停車場原來停著60輛車,開走了10輛,又開走30輛。,現(xiàn)在還剩幾輛車?,60103020(輛),探究二,,,,,,,,,,,,,探究一,,探究二:,停車場原來停著60輛車,開走了10輛,又開來了20輛。,601000(輛),現(xiàn)在有幾輛車?,探究二,,,
4、,,,,,,,,,探究一,,探究二:,20103060(輛),60103030(輛),601000(輛),連加、連減、加減混合運算,按從左往右的順序進行計算。,探究二,練習,練習一,練習二,練習三,,,,,,,,,,,,107 540 1070 4050 35142= 3005401020= 30050 401020=,,,,,,,,,,,,練習一:,1. 口答。,17,80,45,90,9,45,70,7,70,練習一,30,練習二,練習三,,,,,,,,,,,,練習二:,練習一,30,6,38,59,88, 80, 87, 35, 80, 10,練習二,練習三,1.,,,,,,,,
5、,,,,練習二:,2.,練習一,4030 9050 10080 955 8080 606 4020880504 405030= 906010,70,90,40,0,20,66,68,60,34,20,練習二,練習三,練習二:,,,,,,,,,,,,練習一,3.小圖書室有90本故事書。 借出40本,還剩多少本?,904050(本),練習二,練習三,2040 8070 2050 8060 2060 8050 2070 8040,練習三:,,,,,,,,,,,,想一想,算一算。,練習一,60,70,80,90,10,20,30,40,練習二,練習三,小結:,,,,,,,,,,,,小結:,,,,,,,,,,,,在計算時要看清數(shù)字和符號。計算連加、連減、加減混合運算時,按從左到右的順序進行計算。,作業(yè):,,,,,,,,,,,,