四年级数学上册第4单元《三位数乘两位数》口算除法课件新人教版.ppt

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1、三位数乘两位数 (口算乘法),崇阳二小,直接写得数,看谁又准又快。,7 8 = 3 6 = 5 9 = 6 2 = 8 4 = 8 8 = 9 3 = 4 6 = 5 9 = 7 7 =,6 3 + 2 = 2 8 + 4 = 7 5 + 1 = 9 6 + 3 = 8 3 + 2 = 3 7 + 5 = 6 8 + 3 = 3 9 + 6 = 7 4 + 4 = 8 5 + 6 =,笔算下面各题。,47 8 =,390 4 =,人骑自行车1小时 约行16千米。,人骑自行车3小时可以行多少千米?,163=?,163=,答:人骑自行车3小时可以行48千米。,48(千米),63=18,103=30

2、30+18=48,先把个位数和十位数分开乘,再把两个积加起来。,在心中想乘法竖式。,方法三 直接口算,163=,4,1 8,方法一,方法二,方法三 小 结:,1、从多位数的个位算起。,2、口诀加进位。,试练:,182=,128=,145=,193=,2 0,1 6,2 7,1 6,3,7,9,5,特快列车3小时可以行多少千米?,1603=,1 8,4,0,(千米),答:特快列车3小时可以行480千米。,特快列车1小时约行160千米。,智慧城堡,加油啊!,登 山,252=,1506=,713=,184=,1305=,146=,243=,2380=,72,72,50,84,650,760,900,91,小兔子回家,68,96,900,82,480,630,720,92,240,700,840,68,你真棒!,闯关胜利,你收获了 什么?,

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