六年级数学下册2百分数(二)百分数问题解决(例5)课件新人教版.ppt

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1、问题解决 例5,百分数(二),某品牌的裙子搞促销活动,在A商场打五折销售,在B商场按“满100元减50元”的方式销售。妈妈要买一条标价230元的这种品牌的裙子。,问题:在A、B两个商场买,各应付多少钱?选择哪个商场更省钱。,追问:谁能用自己的话说说“满100元减50元”是什么意思?,预设:就是在总价中取整百元部分,每个100元减去50元,不满 100元的零头部分不优惠。,一、探究满几减几的问题,2. 暴露思维,组织研讨。,预设一:23050%115(元) 23050180(元) 预设二:23050%115(元) 230502130(元),监控:你同意谁的想法?说说你的理由。,预设:“满100元

2、减50元”就是说每满一个100元都要减去50元, 因此应该在原价230元的基础上减去2个50元才对。,一、探究满几减几的问题,1. 搜集资源,独立解决。,某品牌的旅游鞋搞促销活动,在A商场按“满100元减40元”的方式销售,在B商场打六折销售。妈妈准备给小丽买一双标价120元的这种品牌的旅游鞋。在A、B两个商场买,各应付多少钱?选择哪个商场更省钱?,一、探究满几减几的问题,4. 巩固练习。,3. 提升认识。,问题:(1)你觉得“满100元减50元”和打五折哪种促销方式更实惠。(2)在什么情况下两种促销方式的结果是一样的?(3)在什么情况下两种促销方式的结果相差的不多?在什么情况下两种促销方式的

3、结果会相差很多呢?,百货大楼搞促销活动,甲品牌鞋满200元减100元,乙品牌鞋“折上折”,就是先打六折,在此基础上再打九五折。,二、探究折上折问题,问题:如果两个品牌都有一双标价260元的鞋,哪个品牌更便宜?,1. 搜集资源,独立解决。,2. 暴露思维,组织研讨。,预设一:260100160(元) 26060%156(元) 预设二:260100160(元) 26060%95%148.2(元),监控:你同意谁的想法?说说你的理由。,预设:“折上折”就是先打六折,然后在此基础上再打个九五折, 所以我同意第二个同学的。,二、探究折上折问题,提问:在解决折上折的问题时我们应该注意什么?,预设:在解决折上折的问题时要乘两次折扣。,3. 提升认识。,

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