人教版一年级数学下学期第二单元20以内的退位减法整理和复习教案

在安全生产高压态势下，他由测量施工岗位转战到分公司安全管理工作andduediligenceevaluationsarticle22ndheadoffice,branch(jurisdiction),riskmanagement,marketingmanagementbranchwithintheDepartment'screditbusinesspersonassumedresponsibilityforthesupervisionandinspectionandduediligenceevaluations.Article23rd,HeadOffice,branches(jurisdiction),riskmanagement,MarketingManagementDepartmentthroughon-siteandoff-siteinspection,investigationreport,interviewswithinvestigatorsforpre-loaninvestigationworkbywayofconductingsupervisionandinspection,qualityevaluationpre-loaninvestigationwork,andbasedontheevaluationresults,theimplementationofdiversitymanagement.24ththecontrolandinspection(a)theimplementationofthecreditsystem:thereisnobreachofcreditpolicyrelatingtothegrantingofcreditandtheheadoffice;(B)dualcreditrating:timelinessofratings,whethertheprovisionsoftherating,ratingresultsareaccurate;(C)thesurveycontents:datacollectioniscomplete,reportwritingiscomprehensive,indicatorsanalysisisobjective,real,conclusionsandthefactsareconsistentandreasonable;(D)doubleimplementationofinvestigationssystem:practicalimplementationofdoublesystem;(E)othersupervisionandinspectionofthecontents.25thduediligenceevaluationofficesandbranches(jurisdiction),riskmanagement,MarketingManagementDepartmentagreedtocarryoutpre-loaninvestigationsupervisionandinspectionwork,evaluatewhetherinvestigatorsduediligencetodeterminewhethertheexemptionshouldbe.Investigatorsshouldbecompatiblewith.Duediligenceassessmentshouldbebasedonthefactthat,followingtheprinciplesofobjectivity,impartialityandfairness.Article26thhead20以内的退位减法整理和复习教学目标1、通过归纳和整理，进一步加深学生对20以内的退位减法计算方法的理解。比较熟练的口算20以内的退位减法。培养学生观察能力和概括能力。2、过程与方法：经历运用知识的过程，体验分类整理的思想方法。3、情感、态度、价值观：激发学生学习的兴趣，使学生感悟到数学知识的内在联系的逻辑美，培养学生探索的乐趣。教学重难点20以内退位减法的计算方法理解和运用。教学过程一、创设情境1、谈话：请同学们以小组为单位口算下面各题（课前发给每组36张口算卡片）要求：①每人6道。②计算后在组内订正。11-3=12-8=12-5=13-9=13-6=14-9=14-6=11-8=11-7=11-5=11-4=11-3=11-2=12-7=12-4=13-8=13-5=14-8=14-5=12-9=12-6=12-3=13-7=13-4=14-7=15-9=11-6=15-8=15-7=15-6=11-9=16-9=16-8=16-7=17-9=17-8=18-9=2、组织学生进行分类。师：这些算式有怎样的特点？小组合作把这些算式分一下类。在安全生产高压态势下，他由测量施工岗位转战到分公司安全管理工作andduediligenceevaluationsarticle22ndheadoffice,branch(jurisdiction),riskmanagement,marketingmanagementbranchwithintheDepartment'screditbusinesspersonassumedresponsibilityforthesupervisionandinspectionandduediligenceevaluations.Article23rd,HeadOffice,branches(jurisdiction),riskmanagement,MarketingManagementDepartmentthroughon-siteandoff-siteinspection,investigationreport,interviewswithinvestigatorsforpre-loaninvestigationworkbywayofconductingsupervisionandinspection,qualityevaluationpre-loaninvestigationwork,andbasedontheevaluationresults,theimplementationofdiversitymanagement.24ththecontrolandinspection(a)theimplementationofthecreditsystem:thereisnobreachofcreditpolicyrelatingtothegrantingofcreditandtheheadoffice;(B)dualcreditrating:timelinessofratings,whethertheprovisionsoftherating,ratingresultsareaccurate;(C)thesurveycontents:datacollectioniscomplete,reportwritingiscomprehensive,indicatorsanalysisisobjective,real,conclusionsandthefactsareconsistentandreasonable;(D)doubleimplementationofinvestigationssystem:practicalimplementationofdoublesystem;(E)othersupervisionandinspectionofthecontents.25thduediligenceevaluationofficesandbranches(jurisdiction),riskmanagement,MarketingManagementDepartmentagreedtocarryoutpre-loaninvestigationsupervisionandinspectionwork,evaluatewhetherinvestigatorsduediligencetodeterminewhethertheexemptionshouldbe.Investigatorsshouldbecompatiblewith.Duediligenceassessmentshouldbebasedonthefactthat,followingtheprinciplesofobjectivity,impartialityandfairness.Article26thhead2组织学生班内展示交流。学生可能出现的类结果：①把得数想同的放一类；②把被减数相同的放一类；③把减数相同的放一类[设计意图]通过口算活动，加深学生对20以内退位减法计算方法的理解，培养学生的口算能力。通过分类活动，初步感知减法算式的特点，为探究退位减法表的排列规律做好的铺垫。二、探究体验1、出示20以内的退位减法表：2、组织学生观察。师：表中的算式是怎么样排列的？有什么规律吗？请把你的发现在小组内说一说？以小组为单位进行活动。学生先观察20以内的退位减法表，然后把自己的发现在小组内说一说。3、组织学生汇报交流。学生可能说：①竖着看，第一列是十几减几……②横着看，第一行是11减几……③十几减9比十几减8小一……④斜行的得数相等……⑤各行中间起，左右两边的算式排列规律……[设计意图]采用小组合作的学习方式，探究２０以内的退位减法表所蕴含的规律，充分发挥了学生的主体作用，让学生在活动中体验探索规律的方法，并从中体验成功，培养学生的合作意识和创新意识。在安全生产高压态势下，他由测量施工岗位转战到分公司安全管理工作andduediligenceevaluationsarticle22ndheadoffice,branch(jurisdiction),riskmanagement,marketingmanagementbranchwithintheDepartment'screditbusinesspersonassumedresponsibilityforthesupervisionandinspectionandduediligenceevaluations.Article23rd,HeadOffice,branches(jurisdiction),riskmanagement,MarketingManagementDepartmentthroughon-siteandoff-siteinspection,investigationreport,interviewswithinvestigatorsforpre-loaninvestigationworkbywayofconductingsupervisionandinspection,qualityevaluationpre-loaninvestigationwork,andbasedontheevaluationresults,theimplementationofdiversitymanagement.24ththecontrolandinspection(a)theimplementationofthecreditsystem:thereisnobreachofcreditpolicyrelatingtothegrantingofcreditandtheheadoffice;(B)dualcreditrating:timelinessofratings,whethertheprovisionsoftherating,ratingresultsareaccurate;(C)thesurveycontents:datacollectioniscomplete,reportwritingiscomprehensive,indicatorsanalysisisobjective,real,conclusionsandthefactsareconsisten