2019秋四年級數(shù)學(xué)上冊 2.6 三位數(shù)除以兩位數(shù)的筆算（五入調(diào)商）課件2 蘇教版.ppt

《2019秋四年級數(shù)學(xué)上冊 2.6 三位數(shù)除以兩位數(shù)的筆算（五入調(diào)商）課件2 蘇教版.ppt》由會員分享，可在線閱讀，更多相關(guān)《2019秋四年級數(shù)學(xué)上冊 2.6 三位數(shù)除以兩位數(shù)的筆算（五入調(diào)商）課件2 蘇教版.ppt（18頁珍藏版）》請在裝配圖網(wǎng)上搜索。

五入調(diào)商,,引入,,新授,,練習(xí),,鞏固練習(xí),27234=,,先列豎式計算，再想一想計算時是怎樣試商和調(diào)商的？,3,0,3,),272,,4,9,3,0,,6,,8,3,4,),272,,2,7,,2,0,8,,,25236=（）,,四(二)班平均每人借書多少本？,四(二)班有36人，共借書252本。,25236=,3,6,),252,,,可以怎樣試商？估計商幾？,,(),,,25236=,3,6,),252,,6,4,0,,(),,,25236=,,先計算，看能發(fā)現(xiàn)什么問題，再分析出現(xiàn)問題的原因。,,(),3,6,),252,,6,4,0,,,25236=,,(),3,6,),252,,6,2,1,,6,6,3,4,0,,,,,,25236=,,繼續(xù)列豎式計算。,,3,6,),252,,,(),3,6,),252,,6,2,1,,6,6,3,4,0,,,7,25236=,,(),7,本,答：四年級二班平均每人借書本。,,7,3,6,),252,,7,2,5,2,,0,,,3,6,),252,,7,2,5,2,,0,3,6,),252,,6,2,1,,6,6,3,4,0,,計算前是怎樣試商的？計算時出現(xiàn)了什么問題？怎樣解決的？,,,,變大,,偏小,調(diào)大,,3,6,),252,,7,2,5,2,,0,3,6,),252,,6,2,1,,6,6,3,4,0,,,,你能比較,這兩道例題計算中的相同點和不同點嗎？,,3,4,),272,,9,3,0,3,0,,6,,3,4,),272,,8,2,7,,2,0,3,6,),252,,7,2,5,2,,0,,3,6,),252,,6,2,1,,6,6,3,4,0,,1,2,,,3,4,),272,,9,3,0,3,0,,6,,3,4,),272,,8,2,7,,2,0,3,),252,,6,7,2,5,2,,0,,3,6,),252,,6,2,1,,6,6,3,4,0,,,調(diào)商,,,3,),272,,4,9,3,0,3,0,,6,,3,),272,,4,8,2,7,,2,0,3,6,),252,,7,2,5,2,,0,,3,6,),252,,6,2,1,,6,6,3,4,0,偏大,調(diào)小,變小,,,,偏小,調(diào)大,變大,,,,,,2,),81,,7,5,4,,2,2,7,3,0,2,),,80,6,5,2,,2,2,8,3,0,3,),315,,9,7,4,0,2,7,,3,4,2,5,,),350,,8,5,6,0,2,9,,0,6,0,根據(jù)試商情況，說出各題準(zhǔn)確的商。,,,,,3,8,1,0,,3,7,8,2,,8,3,1,2,3,,6,3,4,8,2,,,先找出錯在哪里，再改正。,3,),266,,8,6,2,2,,8,3,8,2,7,),192,,6,1,6,,2,3,0,,28,198,,）,,79,634,,）,,37,300,,）,,,46,368,,）,,67,540,,）,,,86,534,,）,,,,一輛汽車每小時行67千米，小華家到省會城市的路程是268千米。小華坐汽車到省會城市需要幾小時？,,