小學四年級數(shù)學除數(shù)是兩位數(shù)的除法課件

第6單元除數(shù)是兩位數(shù)的除法課題1口算除法第6單元除數(shù)是兩位數(shù)的除法1、創(chuàng)設情境口算20×3=6060÷3=2030×9=270270÷3=90394≈1084:6=1431÷3≈1072:4=1826÷5≈554:3=1843÷6≈775:5=15除數(shù)是兩位數(shù)的除法怎樣口算呢?、創(chuàng)設情境2自主探究有80面彩旗,每班分20面,可以分給幾個班?80÷20=4(個)你能口算出這道題嗎你是怎樣想的呢?(4)個20是80,82=4,80÷20=(4)。80÷20=4想一想:83:20≈480:19≈480自主探究3做一做1.60∵20=390÷30=340:20=2100÷20=562÷20≈393÷30≈342÷20≈2103÷20≈5注意觀察每組算式有什么不同孔做一做4150÷50=3你知道150÷50等于幾嗎?你是怎么想的?(3)個50是150,150:50=(3)15÷5=(3)150÷50=(3想一想:122÷30≈4120÷28≈412030150÷50=35做一做口算下面各題,并說一說你是怎么想的。2.180÷30=6240∵40=6420:60=7210÷30=718430≈6240:37≈6420÷:62≈7210:29≈7180406030184:30我是這么想的:把184看成180,180:30=6,所以184:30≈=6做一做6再見再見7第6單元除數(shù)是兩位數(shù)的除法課題2商是一位數(shù)的除法第6單元除數(shù)是兩位數(shù)的除法8、創(chuàng)設情境口算32÷10≈340÷20=290∵30=3152:30≈578÷20≈4150:50=3241:30≈8360÷:60=6除數(shù)是整十數(shù)的除法怎樣比算呢?、創(chuàng)設情境9自主探究1.92本連環(huán)畫,每班30本,可以分給幾個班?9230=3(個)〔你準備怎樣計算?21.口算:92≈90,92:30≈3?？梢苑纸o3個班。2擺小棒,可以看出來:92里面有(3)個30,所以商(3)。L∥自主探究10小學四年級數(shù)學除數(shù)是兩位數(shù)的除法課件11小學四年級數(shù)學除數(shù)是兩位數(shù)的除法課件12小學四年級數(shù)學除數(shù)是兩位數(shù)的除法課件13小學四年級數(shù)學除數(shù)是兩位數(shù)的除法課件14小學四年級數(shù)學除數(shù)是兩位數(shù)的除法課件15小學四年級數(shù)學除數(shù)是兩位數(shù)的除法課件16小學四年級數(shù)學除數(shù)是兩位數(shù)的除法課件17小學四年級數(shù)學除數(shù)是兩位數(shù)的除法課件18小學四年級數(shù)學除數(shù)是兩位數(shù)的除法課件19小學四年級數(shù)學除數(shù)是兩位數(shù)的除法課件20小學四年級數(shù)學除數(shù)是兩位數(shù)的除法課件21小學四年級數(shù)學除數(shù)是兩位數(shù)的除法課件22小學四年級數(shù)學除數(shù)是兩位數(shù)的除法課件23小學四年級數(shù)學除數(shù)是兩位數(shù)的除法課件24小學四年級數(shù)學除數(shù)是兩位數(shù)的除法課件25小學四年級數(shù)學除數(shù)是兩位數(shù)的除法課件26小學四年級數(shù)學除數(shù)是兩位數(shù)的除法課件27小學四年級數(shù)學除數(shù)是兩位數(shù)的除法課件28小學四年級數(shù)學除數(shù)是兩位數(shù)的除法課件29小學四年級數(shù)學除數(shù)是兩位數(shù)的除法課件30小學四年級數(shù)學除數(shù)是兩位數(shù)的除法課件31小學四年級數(shù)學除數(shù)是兩位數(shù)的除法課件32小學四年級數(shù)學除數(shù)是兩位數(shù)的除法課件33小學四年級數(shù)學除數(shù)是兩位數(shù)的除法課件34小學四年級數(shù)學除數(shù)是兩位數(shù)的除法課件35小學四年級數(shù)學除數(shù)是兩位數(shù)的除法課件36小學四年級數(shù)學除數(shù)是兩位數(shù)的除法課件37小學四年級數(shù)學除數(shù)是兩位數(shù)的除法課件38小學四年級數(shù)學除數(shù)是兩位數(shù)的除法課件39小學四年級數(shù)學除數(shù)是兩位數(shù)的除法課件40小學四年級數(shù)學除數(shù)是兩位數(shù)的除法課件41小學四年級數(shù)學除數(shù)是兩位數(shù)的除法課件42小學四年級數(shù)學除數(shù)是兩位數(shù)的除法課件43小學四年級數(shù)學除數(shù)是兩位數(shù)的除法課件44小學四年級數(shù)學除數(shù)是兩位數(shù)的除法課件45小學四年級數(shù)學除數(shù)是兩位數(shù)的除法課件46小學四年級數(shù)學除數(shù)是兩位數(shù)的除法課件47小學四年級數(shù)學除數(shù)是兩位數(shù)的除法課件48小學四年級數(shù)學除數(shù)是兩位數(shù)的除法課件49小學四年級數(shù)學除數(shù)是兩位數(shù)的除法課件50小學四年級數(shù)學除數(shù)是兩位數(shù)的除法課件51小學四年級數(shù)學除數(shù)是兩位數(shù)的