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口算乘法(,2,),R,三,年,册,级,下,(,1,)每袋有,6,个橙子,,10,袋有多少个橙子?,610=_,导入新课,610=_,因为,6,个,10,是,60,,,所以,610=60,。,利用乘法计算,69=54,54+6=60,自主探究,把,10,盒橙子分成,2,个,5,盒,即,65=30,,,30+30=60,。,直接算,61=6,,然后在积的后面添个,0,即可。,60,610=_,尝试应用,发现规律,1810,510,910,4010,50,90,180,400,迁移类推,得出方法,(,2,)每盒有,12,个苹果,,20,盒有多少个苹果?,1220=_,1220=_,先算,122=24,,再在积的末尾添,1,个,0,就行了。,把,12,分成,10,和,2,,,先算,,1020=200,,再算,220=40,,,200+40=240,。,240,1230,12030,3130,31030,1420,14200,3020,30200,360,3600,930,9300,280,2800,600,6000,2110,4120,253,1320,165,1330,1240,1140,442,3030,173,2403,1.,210,820,75,260,80,390,480,440,88,900,51,720,巩固练习,用,90,厘米长的丝绳可以编一个中国结。王阿姨有一捆,10,米长的丝绳,要编,8,个这样的中国结,够吗?,890,720,(厘米),2.,10,米,1000,厘米,720,1000,,够,通过本节课的学习,你有哪些收获呢?,课堂小结,在()里填上合适的数。,(),(),=4800,(),(),=4800,(),(),=4800,(),(),=4800,48,(),(),=4800,(),(),=4800,100,24,200,60,80,480,10,240,20,600,8,备选练习,
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