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口算乘法,人民教育出版社版三年级下册,10,个,一是(,),10,个十是(,),10,个百是(,),10,个,千是(,),10,1000,10000,100,记忆宝库,1、我会填。,记忆宝库,341=,302=,123=,403=,352=,507=,34,120,60,70,36,350,133=,520=,100,39,2、我是口算小能手。,我平均每天要送,300,份报纸和,60,封信。,邮递员工作,10,天,要送多少份报纸?,要送多少封信?,十个三百是三千。,30010=,3000,(份),十个六十是六百。,6010=,600,(封),我平均每天要送,300,份报纸和,60,封信。,30030=,9000,(份),邮递员工作,30,天,要送多少份,报纸?,要送多少份报纸?,3,3,=9,0,00,00,0,60 30=,1800,(封),6,3,=18,0,0,0,0,1,2,2,0,0,=,7,0,0,2,0,=,6,0,2,0,=,24,1,0,=,9,0,9,0,=,12,00,24,0,14,000,81,00,24,00,5,0,4,0,=,20,00,口算。,整十整百数乘,整十数:,先,把两个因数,0,前面的数相乘,再看两个因数末尾,共,有几个,0,,就在积的末尾添,上几个,0,。,填空我最棒,1,、口算,3050,时,可以这样想:先用(),()得(),再在()后边添上()个,0,。,2,、口算,2230,时,可以这样想:先计算(),()得(),再在()后边添上()个,0,。,3,5,15,15,2,22,3,66,66,1,606,0,=,3600,6030,0,=,18000,503,0,=,1500,807,0,=,5600,409,0,=,3600,232,0,=,460,小博士夺红旗,7,0,6,0=,4200,50,0,3,0=,15000,4,0,7,0=,2800,33,3,0=,990,9,0,8,0=,7200,5,0,5,0=,2500,2,0,9,0=,1800,12,4,0=,480,8,0,6,0=,4800,1,、体育场的观众席共分,20个方阵,每个方阵有座位3,4,个,这个体育场可以容纳多少名观众?,35,20=680,(名),答:这个体育场可以容纳,680,名观众。,2,4,元/个,2,、王阿姨要买,20,个这样的娃娃,她带了,500,元,够吗?,24,20=480,(元),500480,答:她带,500,元,够了。,每枝,6,元,每本,9,元,3,、我,买,20,枝,和,30,本,,一共,需要多少钱?,20,6=120,(元),30,9=270,(元),120+270=390,(元),答:一共需要,390,元钱。,每枝,6,元,每本,9,元,3,、我,买,20,枝,和,30,本,,一共,需要多少钱?,206+309=390,(元),答:一共需要,390,元钱。,我每分钟大约行,400,米。,邮递员,30,分钟行多,少米?合多少千米?,40030=12000,(米),12000,米,=12,千米,答:邮递员,30,分钟行,12000,米,合,12,千米。,思维训练,我每分钟大约行,400,米。,如果每天用,2,小时送信,和报纸,邮递员每天大,约行多少千米?,2,小时,=120,分钟,48000,米,=48,千米,答:邮递员每天大约行,48,千米。,400120=48000,(米),说说你的收获吧!,谢谢,
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