笔者在多年的教学实践中总结出“折扣”问题的解读及后继辅导,用于小升初辅导的教学实践中,收到了良好的效果。愿与各位同行共同研讨。一、折扣的概念、意义、计算公式折扣的概念:商店有时降价出售商品,叫做打折扣销售,通称“打折”。折扣的意义:打几折就表示该商品按原价的十分之几进行销售,也就是按原价的百分之几十进行销售,故:折扣表示的是一个小于1的比值。计算公式:折扣=商品的售价÷商品的原价(或标价)(折扣<1)商品的售价=商品的原价(或标价)×折扣(折扣<1)商品的原价=商品的售价÷折扣(折扣<1)二、学生容易出现的误区1.学生初学折扣问题,有时把打几折销售理解为:商品的售价=商品的原价×几。如:买一件T恤衫,原价80元,现打六五折出售,应付多少钱?学生的计算方法是:80×6.5=520(元),结果出现错误,不但没有降价,反而提价了。原因是没有正确理解“折扣”的意义,“打六五折出售”就是按原价的65%(或6.5/10)出售。正确的计算方法为:80×65%=52(元)。2.在解决实际问题时,有一学生常常把打几折出售错误的理解为商品原价(或标价)降低了十分之几。如:新华商店“十一”搞促销活动,把原价90元的书包打七折出售,小红买一个这种书包应付多少钱?学生的计算方法:90-90×1/10=27(元),结果出现错 The author summarizes many years of teaching practice “discount ” interpretation of the problem and follow-up counseling for the teaching of small liters counseling, received good results. Is willing to work together with colleagues to discuss. First, the concept of discount, meaning, formula The concept of discount: the store sometimes sell goods at reduced prices, called discounted sales, commonly known as “discount ”. The meaning of the discount: playing a few fold means that the product is sold for a few tenths of the original price, that is, dozens of percentages of the original price for sale. Therefore, the discount represents a ratio less than one. Calculation formula: discount = price of the product ÷ price of the product (or price) (discount <1) price of the product = price of the product (or price) × discount (discount <1) price of the product = price of the product ÷ Discount (discount <1) Second, the students prone to misunderstanding 1. Students beginner discount problem, sometimes to fight a few folds Sales understood as: the price of goods = the original price of goods × a few. Such as: to buy a T-shirt, the original price of 80 yuan, is now selling sixty percent off the sale, how much to deal with? Student’s calculation is: 80 × 6.5 = 520 (yuan), the results of an error, not only did not cut prices, . The reason is that the meaning of “discount ” is not correctly understood. “Sixty percent off sale ” is sold at 65% (or 6.5 / 10) of the original price. The correct calculation is: 80 × 65% = 52 (yuan). 2. In solving practical problems, one student often misreads the selling price by a few tenths of the original price (or price) of the commodity. Such as: Xinhua shop “eleven ” engaged in promotional activities, the original price of 90 yuan to play the bookstore sold 30% off, red to buy a bag how much to deal with this? The calculation of the students: 90-90 × 1/10 = 27 (Yuan), the result appears wrong