数学北师大版八年级下册异分母分式的加减法.docx

Mathematics Teaching plan1. Teaching Plan Information 教案信息Grade/ Level年级/水平:Grade 8Teacher任课教师: 张艳玲Topic主题:Adding and subtracting algebraic fraction分式的加减法Period课时: 第2课时 The second classStatement of Inquiry探究陈述: 发现数学关系有助于更好地理解代数计算系统是怎样演变的。Working on mathematical relationship helps understand the changes of the algebra calculation systemInquiry question探究问题:如何进行异分母分式的加减 How to add and subtract algebraic fractions with different denominator?Global contexts全球背景: 身份认同与关系Identities and RelationshipsKey concepts重大概念:关系 relationshipRelated concepts相关概念：变化,等值 change, equivalence2. Teaching objectives教学目标1. 掌握找分式的最简公分母的方法。Students could find the LCM of denominator with skill2. 掌握异分母分式的加法和减法，正确写计算结果。Students could add and subtract algebraic fractions with different denominator efficiently and show final answer correctly.3. Teaching procedures 教学过程Adding and subtracting algebraic fraction 分式的加减法(2)Learning Resources学习资源 Vocabularynumerical fraction 分数 algebraic fraction 分式 numerator 分子 denominator 分母 rational expression 有理式 reduction of a fraction 约分 integral expression 整式 simplest fraction 最简分式 common factor 公因式 the LCM(lowest common multiple) of denominator 最简公分母Lead in : Calculate: We have learnt: we will learn:异分母分式如何进行加法或者减法？ How to add or subtract algebraic fractions with different denominator?_Inquiry : Convert fractions to the same denominator. 通分A分母是单项式 The denominator is monomial(1) （2）, How to find the LCM of denominator_B分母是二项式The denominator is binomial(1) (2) (3) How to find the LCM of denominator_C分母是多项式 The denominator is polynomial（1） (2) How to find the LCM of denominator_ Inquiry ：Calculate: adding and subtracting algebraic fraction 分式的加减运算A分母是单项式 The denominator is monomial（1） Tips:_B分母是二项式The denominator is binomial Tips:_C分母是多项式 The denominator is polynomial（1） （2） Tips:_4. Assessment (formative or summative) 评估（形成性评估和总结性评估）1.Find the LCM of denominator _2.Convert the following fractions to the same denominator 3. Calculate: adding and subtracting algebraic fraction（1） （2） （3） （4） 5. Approaches to learning 学习方法思考技能，研究技能，自我管理技能。Thinking ,inquiry,