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1、第4课时 单价、数量和总价,R四年级上册,如何列式？,为什么用乘法计算？,一、复习导入,803240（元）,解答下面的问题。,求3个80是多少。,绿色圃中小学教育网http:/,绿色圃中小学教育网http:/,绿色圃中小学教育网http:/,绿色圃中小学教育网http:/,绿色圃中小学教育网http:/,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成
2、才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,一、新课导入,10440（元）,803240（元）,解答下面的问题。,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才
3、路,状元成才路,二、探索新知,10440（元）,803240（元）,解答下面的问题。,在前面的学习中，我们经常会见到一些数量关系，下面我们就来总结两种常见的数量关系。,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,10440（
4、元）,803240（元）,解答下面的问题。,这两个问题有什么共同点？,都是已知每件商品的价钱。,还知道买了多少件商品，最后算,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,每件商品的价钱，叫做单价；买了多少，叫做数量；一共用的
5、钱数，叫做总价。,篮球每个80元记作:,80元/个,鱼每千克10元记作:,10元/千克,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,每件商品的价钱，叫做单价；买了多少，叫做数量；一共用的钱数，叫做总价。,你知道单价、数量与总
6、价之间的关系吗？,单价数量总价,已知（）和（），求（）,算式：,单价,数量,总价,80 3=240（元）,数量关系式为：,单价,数量,总价,=,已知（）和（），求（）,算式：,单价,数量,总价,10 4=40（元）,数量关系式为：,单价,数量,总价,=,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路
7、,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,10440（元）,803240（元）,解答下面的问题。,单价,数量,总价,单价,数量,总价,803240（元）,10440（元）,每件商品的价钱，叫做单价；,买了多少，叫做数量；,一共用的钱数，叫做总价。,你知道单价、数量与总价之间的关系吗？,解答下面的问题。,单价数量总价,二、探究新知,单价,数量,总价,=,总价,单价,数量,=,总价,单价,数量,=,单价、数量、总价的关系,已知（）和（），求（）,算式：,单价,数量,总价,40 10=4（千克）,数量关系式为：,总价,单价,数量,=,每件商品的价钱叫做,-单价,购买商
8、品的多少叫做,-数量,一共花的钱数叫做,-总价,单价数量=总价,总价 数量=单价,总价 单价=数量,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,不解答，只说出下面各题已知的是什么，要求的是什么。,（1）每套校服120元，买5
9、套要用多少钱？,已知单价和数量，求总价。,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,（2）学校买了3台同样的复读机，花了420元，每台复读机多少元？,已知数量和总价，求单价。,他的钱够用吗？,小明的爸爸带了4000元钱，要
10、买16个篮球和12个足球。,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,2.填空。,每件商品的价钱叫（），买多少叫（），一共用多少钱叫（），它们之间的关系是（）。,总价,数量,单价,单价数量总价,买4个篮球一共花了428元，
11、再买6个同样的篮球，还要花多少钱？,天天超市打算采购135支单价为6元的牙刷，如果用这些钱采购两支装的，可以买90套。两支装的牙刷价格是多少?,“绿之深”花坊的观赏蔬菜一 袖珍南瓜处于热销的中。（1）每盆进价12元，200盆袖珍南瓜进货应付多少元?(2)花坊以每盆16元的价格卖出170盆后、开始以每盆8元降价销售。如果全部售出，你认为赚钱还是赔钱?,小红从工厂批发了90个米奇书包.（1）从工厂批发的书包每个178元,商店要付给工厂多少元?（2）商店在卖75个书包后,开始降价销售.如果商品全部售出,你认为商店是赚钱还是亏损?(原价218元个,现价158元个）,商店从工厂批发了105个书包，每个7
12、5元，卖出80个后，开始降价销售如果这批书包全部售出，商店赚了多少元？,原价90元现价68元,商店从工厂批发了80台录音机。（1）商店从工厂批发了80台录音机，每台140元，商店要付给工厂多少元？（2）商店在卖出70台录音机后，开始降价销售。如果这批录音机全部售出，你认为商店是赚钱还是赔本？,原价160元现价138元,超市从工厂批发120个书包,每个60元。【1】批发的书每个60元。超市从工厂批发了120个书包，超市一共要付给工厂多少元？【2】超市在卖出90个书包之后,开始降价售。如果商品全部卖出，你认为商店是赚钱还是亏损？,原价78元，现价55元,状元成才路,状元成才路,状元成才路,状元成才
13、路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,3.妈妈买了6双袜子，每双袜子8元，一共需要多少元钱？,68=48（元）,答：一共需要48元。,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才
14、路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,4.列式解答。,（1）王丽到商店买圆珠笔，用12元买了6支，每支笔多少钱？,126=2（元）,答：每支笔2元。,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元
15、成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,（2）王丽到商店买圆珠笔，圆珠笔的单价是2元，12元能买多少支？,122=6（支）,答：12元能买6支。,易购超市5千克苹果售价30元，2千克香蕉售价8元。小红的妈妈打算买9千克苹果和7千克香蕉，一共需要多少元钱？,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,四、课堂小结,单价、数量和总价,80 3=240,单价,数量,总价,单价数量总价,王大爷用100米的篱笆围成一个长方形的鸡舍，想一想，怎样围才能使鸡舍的面积最大。最大是多少?,
