the principle of simplified EIA of construction projects in the region. In terms of land, linked to the implementation of urban and rural construction land increase and decrease, replacement indicators for priority areas project. Charges, into the projects of water, electricity, administrative charges and preferential policies. In the area of taxation, and settled in areas of industry and its production company, within 5 years after the completion of fiscal incentives to enterprises. In terms of financing, integration of land, tax, financial and other resources, and construct \nment credit + business credit\dit system, establishment of marketization, commercialization and modernization of the investment and financing platform; effective Bank-enterprise docking, encourages private capital into the Park, to raise industry development fund. 5, optimize the environment and service industries. To create \owlands, Highlands, integrity of service land, development land\l, to optimizethe area under development environment. All administrative law enforcement departments to appoint a full-time personnel stationed in areas dedicated to coordinating and solving problems associated with businesses in this sector. When there are substantial issues, sector leaders arranged to personally intervene, in-person, in-person push tangible area building a green light, easy line. To further reduce and standardize administrative examination and approval items, simplify examination and approval links, improve efficiency; according to the ...Since the educational practice of the mass line of the party, himself seriously in the education, practical control central \nd opposing \nds\practicing %uns\nd check the spirit of Jiao Yulu, ideology, solicit opinions based on outstanding problems checked swing, careful analysis and reflection. Will now check report is as follows: first, adherence to the party's political discipline, eight in the central provision, change the style of the basic situation of 1, in compliance with the party's political disciplines. Conscientiously abide by the party's political discipline, abide by the Constitution and the rules and regulations of the party, in the political, ideological and maintain highly consistent with the CPC Central Committee on the action, there is no violation of the party's political discipline problems. 2, in the implementation of the central authorities of the eight provisions. Improving research, improving research methods, but there are less grass-roots units, primary first-hand an inadequate grasp of the problem, which is to be strengthened in the future. Second, construction, strictly in accordance with the provisions to streamline and improve the quality of meetings of the Conference. Third, streamlining file briefs, culture involves all aspects of propaganda and ideology, sometimes due to the practical needs of invention notifications, this area needs further第六单元 两、三位数的加法和减法
教材分析：
本单元是整数加、减法教学的最后一个单元。安排的口算、笔算都是学生日常生活中需要的、经常接触的、最基本的运算，且笔算的教学要求基本控制在三位数加、减的范围内，既确保了数学课程标准提出的基本要求，又在一定程度上减轻了学生的课业负担。为此，本单元适当加强了估算的教学内容，引导学生在运用估算解决问题的过程中培养估算意识，发展估算能力。学好这部分内容，不仅可以全面理解和掌握笔算加、减法的算理和算法，还为进一步学习两位数乘两、三位数和三位数除以两位数以及小数的加、减法，打下坚实的基础。这部分内容可以帮助学生初步了解两步计算实际问题的结构，掌握分析数量关系的方法，为以后学习含有两级运算的两步计算实际隔位退位减的计算过程比较复杂，学生很容易发生错误，所以三位数加、减法笔算中连续进位加和退位减、隔位退位减是本单元教学的难点。
教学目标：
1.使学生结合具体的问题情境，探索并理解两位数加两位数、整十数加整十数、整百数加整百数以及相应的减法的口算方法，能正确的进行口算；能正确的进行接近整百、整千数的加、减法估算。
2.使学生结合具体的实际问题，探索并理解两、三位数加法和减法的笔算方法，能正确地进行计算。
3.使学生经历探索并归纳加、减计算方法的过程，进一步培养初步的观察、比较、分析、概况和推理能力。
教学重点：
1.两位数加、减两位数的口算； 2. 三位数加、减法的笔算； 3.两步计算的加减法实际问题。 教学难点：连续进位加和连续退位减。 课时安排：
17课时
2课时练习与机动
streamlining. Four are standard visits, except as required to participate in training, no other activity. Five is to improve news reporting, for propaganda work strictly according to the regulations. Six is strictly your presentation published strictly according to the regulations. Seven is strictly thrift, required the use of vehicles and office space and corporate hospitality. 3, change the style. Propaganda and ideological work of the new situation and new requirements of the new tasks, had done a lot of fruitful work, has made many achievements, but further closer to the grass roots, close to reality, close to the masses and also inadequate innovation must continue to improve. Second, the \s 1, oppose formalism. One theory is that he didn't, with less close contact. Theoretical study of consciousness is not high enough, system performance is not strong enough; more passive learning, active learning few generalities and learn more, delving into less. Especially based on rational thinking on major issues, applying theory to guide the work done is not good enough, not really understand and grasp the spirit and essence of the scientific Outlook on development, did not truly achieve mastery, to apply, to a certain extent, affect the development and implementation of ideas and initiatives. Second, work arrangements, and less supervision. Propaganda and ideological work is the objective, which needs to keep the continuity efforts deployed, but stressed in the work time, less supervision. For example, color weekends in the summer theatrical activities, city square performances, urging townships, communities and rural areas shows the implementation is inadequate, insufficient cultural an educational role to play. Third base enough, master grass-less real. Propaganda and ideological work in the new situation of characteristics and regularity of enough, deep enough for grass-roots public opinion Dynamics survey, for grass-roots typically driveless. For example, rural culture team active, ... I'm not actively take the initiative to take up, the lack of spirit of daring to, resulting in some job had a lot of power, but no tangible results. Third, innovation, lack of motivation. Emancipation did not end, innovation does not exist. In practical work, not your head, previous work experience, lack of innovation initiatives, study on the characteristics of propaganda and ideological work under the new situation through, grip on grassroots ideological trends and changes are not deep, to promote new initiatives and explore new methods of ideological and cultural work is not much, and some lack of relevance and timeliness. 4, discipline, lowering, and hard work are lacking. While working and enterprising spirit down. No real solution to treat yourself right, correctly treat past honors, their complacency, and work to see their scores more, less checking his own shortcomings, like to listen to the praise, satisfied face, online promotion, there artypical, and lack of high standards and strict requirements, the effect is real. Second hard drive less. On hard and the principle of simplified EIA of construction projects in the region. In terms of land, linked to the implementation of urban and rural construction land increase and decrease, replacement indicators for priority areas project. Charges, into the projects of water, electricity, administrative charges and preferential policies. In the area of taxation, and settled in areas of industry and its production company, within 5 years after the completion of fiscal incentives to enterprises. In terms of financing, integration of land, tax, financial and other resources, and construct \ernment credit + business credit\dit system, establishment of marketization, commercialization and modernization of the investment and financing platform; effective Bank-enterprise docking, encourages private capital into the Park, to raise industry development fund. 5, optimize the environment and service industries. To create \owlands, Highlands, integrity of service land, development land\l, to optimizethe area under development environment. All administrative law enforcement departments to appoint a full-time personnel stationed in areas dedicated to coordinating and solving problems associated with businesses in this sector. When there are substantial issues, sector leaders arranged to personally intervene, in-person, in-person push tangible area building a green light, easy line. To further reduce and standardize administrative examination and approval items, simplify examination and approval links, improve efficiency; according to the ...Since the educational practice of the mass line of the party, himself seriously in the education, practical control central \eight rules\nd opposing \nds\practicing %uns\nd check the spirit of Jiao Yulu, ideology, solicit opinions based on outstanding problems checkd swing, careful analysis and reflection. Will now check report is as follows: first, adherence to the party's political discipline, eight in the central provision, change the style of the basic situation of 1, in compliance with the party's political disciplines. Conscientiously abide by the party's political discipline, abide by the Constitution and the rules and regulations of the party, in the political, ideological and maintain highly consistent with the CPC Central Committee on the action, there is no violation of the party's political discipline problems. 2, in the implementation of the central authorities of the eightprovisions. Improving research, improving research methods, but there are less grass-roots units, primary first-hand an inadequate grasp of the problem, which is to be strengthened in the future. Second, construction, strictly in accordance with the provisions to streamline and improve the quality of meetings of the Conference. Third, streamlining file briefs, culture involves all aspects of propaganda and ideology, sometimes due to the practical needs of invention notifications, this area needs further第一课时 两位数加两位数的口算
教学内容：教材第59-60页例1和“想想做做”第1-5题。 教学目标：
1．使学生经历两位数加两位数口算方法的探索过程，体验不同算法间的联系，整合并掌握两位数加两位数的口算方法，能正确地口算两位数加两位数的得数。
2．使学生在从现实情境中提出问题并探索口算方法的过程中，培养提出问题、解决问题的初步能力；感受探索口算方法的不同策略，发展初步的分析、比较和抽象、概况等思维能力；体验新旧知识间的联系，感受转化思想，积累联系已有认识学习新知识的初步经验。
3．使学生主动参与思考、交流等活动，产生对数学学习的兴趣，初步培养与同伴合作、交流的意识；感受探索口算方法的成功感，提升学习数学的自信心。
教学重点：
掌握两位数加两位数的口算方法。 教学难点：
理解两位数加两位数的口算方法。 教具准备：课件 教学过程： 一、先学探究 1．口算：
15+4 8+9 20+3 7+16 让学生说说是怎样口算的。
2．出示例1的情境图。学校跳绳比赛活动，你从图中能知道什么？根据这些已知条件可以提出什么问题。
教师根据学生的回答板书：小红跳了多少下？小军跳了多少下？ 二、交流共享
明确问题：“小红比小华多跳23下，小军比小华多28下”是什么意思？分别怎样列式？
学生口头列式，教师板书算式，提问：你能口算出得数吗？
同桌之间互相说说是怎样算的。在此基础上，在指名说说，并适当加以点评。对于不同的口算方法，教师可以有选择地板书。
引导学生总结两道算式的共同点，揭示课题：两位数加两位数的口算。 提问：这两道题在计算时有什么相同和不同？
交流中小结：这两道题都是两位数加两位数，口算时都可以采用相同的思路
streamlining. Four are standard visits, except as required to participate in training, no other activity. Five is to improve news reporting, for propaganda work strictly according to the regulations. Six is strictly your presentation published strictly according to the regulations. Seven is strictly thrift, required the use of vehicles and office space and corporate hospitality. 3, change the style. Propaganda and ideological work of the new situation and new requirements of the new tasks, had done a lot of fruitful work, has made many achievements, but further closer to the grass roots, close to reality, close to the masses and also inadequate innovation must continue to improve. Second, the \s 1, oppose formalism. One theory is that he didn't, with less close contact. Theoretical study of consciousness is not high enough, system performance s not strong enough; more passive learning, active learning few generalities and learn more, delving into less. Especially based on rational thinking on major issues, applying theory to guide the work done is not good enough, not really understand and grasp the spirit and essence of the scientific Outlook on development, did not truly achieve mastery, to apply, to a certain extent, affect the development and implementation of ideas and initiatives. Second, work arrangements, and less supervision. Propaganda and ideological work is the objective, which needs to keep the continuity efforts deployed, but stressed in the work time, less supervision. For example, color weekends in the summer theatrical activities, city square performances, urging townships, communities and rural areas shows the implementation is inadequate, insufficient cultural an educational role to play. Third base enough, master grass-less real. Propaganda and ideological work in the new situation of characteristics and regularity of enough, deep enough for grass-roots public opinion Dynamics survey, for grass-roots typically driveless. For example, rural culture team active, ... I'm not actively take the initiative to take up, the lack of spirit of daring to, resulting in some job had a lot of power, but no tangible results. Third, innovation, lack of motivation. Emancipation did not end, innovation does not exist. In practical work, not your head, previous work experience, lack of innovation initiatives, study on the characteristics of propaganda and ideological work under the new situation through, grip on grassroots ideological trends and changes are not deep, to promote new initiatives and explore new methods of ideological and cultural work is not much, and some lack of relevance and timeliness. 4, discipline, lowering, and hard work are lacking. While working and enterprising spirit down. No real solution to treat yourself right, correctly treat past honors, their complacency, and work to see their scores more, less checking his own shortcomings, like to listen to the praise, satisfied face, online promotion, there artypical, and lack of high standards and strict requirements, the effect is real. Second hard drive less. On hard andthe principle of simplified EIA of construction projects in the region. In terms of land, linked to the implementation of urban and rural construction land increase and decrease, replacement indicators for priority areas project. Charges, into the projects of water, electricity, administrative charges and preferential policies. In the area of taxation, and settled in areas of industry and its production company, within 5 years after the completion of fiscal incentives to enterprises. In terms of financing, integration of land, tax, financial and other resources, and construct \nment credit + business credit\dit system, establishment of marketization, commercialization and modernization of the investment and financing platform; effective Bank-enterprise docking, encourages private capital into the Park, to raise industry development fund. 5, optimize the environment and service industries. To create \owlands, Highlands, integrity of service land, development land\l, to optimizethe area under development environment. All administrative law enforcement departments to appoint a full-time personnel stationed in areas dedicated to coordinating and solving problems associated with businesses in this sector. When there are substantial issues, sector leaders arranged to personally intervene, in-person, in-person push tangible area building a green light, easy line. To further reduce and standardize administrative examination and approval items, simplify examination and approval links, improve efficiency; according to the ...Since the educational practice of the mass line of the party, himself seriously in the education, practical control central \eight rules\nd opposing \nds\practicing %uns\nd check the spirit of Jiao Yulu, ideology, solicit opinions based on outstanding problems checked swing, careful analysis and reflection. Will now check report is as follows: first, adherence to the party's political discipline, eight in the central provision, change the style of the basic situation of 1, in compliance with the party's political disciplines. Conscientiously abide by the party's political discipline, abide by the Constitution and the rules and regulations of the party, in the political, ideological and maintain highly consistent with the CPC Central Committee on the action, there is no violation of the party's political discipline problems. 2, in the implementation of the central authorities of the eight provisions. Improving research, improving research methods, but there are less grass-roots units, primary first-hand an inadequate grasp of the problem, which is to be strengthened in the future. Second, construction, strictly in accordance with the provisions to streamline and improve the quality of meetings of the Conference. Third, streamlining file briefs, culture involves all aspects of propaganda and ideology, sometimes due to the practical needs of invention notifications, this area needs further和方法，只是第一道相加时不需要进位，第二道相加时需要进位。今后在口算时要注意适当加以区分。
三、反馈检测
1． 完成“想想做做”第1、2题。
让学生看清题意后把口算的结果直接写在教材上。 集体反馈，电脑验证。 比较每组题的异同点。
第1题让学生体会如何在两位数加整十数、两位数加一位数的基础上思考计算两位数加两位数的计算。
第2题让学生体会进位加与不进位加在计算方法上的联系与区别。 2．完成“想想做做”第3题。
选出其中一组题让学生先估算再口算，并请学生说说估算的理由，将估算的结果和口算结果对照，看有无错误。
其余每组题同桌合作完成。集体订正。
小结：在口算之前先估算，可以预测口算的得数。在口算之后再估算，可以验证口算的结果。希望同学们今后自觉地在计算前或计算后进行估算。
3．完成“想想做做”第4题。 学生根据要求在教材上填表。
集体订正。说说自己是怎样算的，以及为什么这样算。 4．完成“想想做做”第5题。
让学生根据情境图，提出加法计算的问题，学生独立列式计算。
集体订正。让学生将自己分析、思考的过程说给大家听，同学间互相补充、互相评价。
四、反思总结
提问：今天这节课学习了什么？有什么收获和体会？ 归纳：这节课我们学会了两位数加两位数的口算。 五、课堂作业
streamlining. Four are standard visits, except as required to participate in training, no other activity. Five is to improve news reporting, for propaganda work strictly according to the regulations. Six is strictly your presentation published strictly according to the regulations. Seven is strictly thrift, required the use of vehicles and office space and corporate hospitality. 3, change the style. Propaganda and ideological work of the new situation and new requirements of the new tasks, had done a lot of fruitful work, has made many achievements, but further closer to the grass roots, close to reality, close to the masses and also inadequate innovation must continue to improve. Second, the \s 1, oppose formalism. One theory is that he didn't, with less close contact. Theoretical study of consciousness is not high enough, system performance is not strong enough; more passive learning, active learning few generalities and learn more, delving into less. Especially based on rational thinking on major issues, applying theory to guide the work done is not good enough, not really understand and grasp the spirit and essence of the scientific Outlook on development, did not truly achieve mastery, to apply, to a certain extent, affect the development and implementation of ideas and initiatives. Second, work arrangements, and less supervision. Propaganda and ideological work is the objective, which needs to keep the continuity efforts deployed, but stressed in the work time, less supervision. For example, color weekends in the summer theatrical activities, city square performances, urging townships, communities and rural areas shows the implementation is inadequate, insufficient cultural an educational role to play. Third base enough, master grass-less real. Propaganda and ideological work in the new situation of characteristics and regularity of enough, deep enough for grass-roots public opinion Dynamics survey, for grass-roots typically driveless. For example, rural culture team active, ... I'm not actively take the initiative to take up, the lack of spirit of daring to, resulting in some job had a lot of power, but no tangible results. Third, innovation, lack of motivation. Emancipation did not end, innovation does not exist. In practical work, not your head, previous work experience, lack of innovation initiatives, study on the characteristics of propaganda and ideological work under the new situation through, grip on grassroots ideological trends and changes are not deep, to promote new initiatives and explore new methods of ideological and cultural work is not much, and some lack of relevance and timeliness. 4, discipline, lowering, and hard work are lacking. While working and enterprising spirit down. No real solution to treat yourself right, correctly treat past honors, their complacency, and work to see their scores more, less checking his own shortcomings, like to listen to the praise, satisfied face, online promotion, there artypical, and lack of high standards and strict requirements, the effect is real. Second hard drive less. On hard andthe principle of simplified EIA of construction projects in the region. In terms of land, linked to the implementation of urban and rural construction land increase and decrease, replacement indicators for priority areas project. Charges, into the projects of water, electricity, administrative charges and preferential policies. In the area of taxation, and settled in areas of industry and its production company, within 5 years after the completion of fiscal incentives to enterprises. In terms of financing, integration of land, tax, financial and other resources, and construct \ernment credit + business credit\dit system, establishment of marketization, commercialization and modernization of the investment and financing platform; effective Bank-enterprise docking, encourages private capital into the Park, to raise industry development fund. 5, optimize the environment and service industries. To create \owlands, Highlands, integrity of service land, development land\l, to optimizethe area under development environment. All administrative law enforcement departments to appoint a full-time personnel stationed in areas dedicated to coordinating and solving problems associated with businesses in this sector. When there are substantial issues, sector leaders arranged to personally intervene, in-person, in-person push tangible area building a green light, easy line. To further reduce and standardize administrative examination and approval items, simplify examination and approval links, improve efficiency; according to the ...Since the educational practice of the mass line of the party, himself seriously in the education, practical control central \eight rules\nd opposing \nds\practicing %uns\nd check the spirit of Jiao Yulu, ideology, solicit opinions based on outstanding problems checkd swing, careful analysis and reflection. Will now check report is as follows: first, adherence to the party's political discipline, eight in the central provision, change the style of the basic situation of 1, in compliance with the party's political disciplines. Conscientiously abide by the party's political discipline, abide by the Constitution and the rules and regulations of the party, in the political, ideological and maintain highly consistent with the CPC Central Committee on the action, there is no violation of the party's political discipline problems. 2, in the implementation of the central authorities of the eightprovisions. Improving research, improving research methods, but there are less grass-roots units, primary first-hand an inadequate grasp of the problem, which is to be strengthened in the future. Second, construction, strictly in accordance with the provisions to streamline and improve the quality of meetings of the Conference. Third, streamlining file briefs, culture involves all aspects of propaganda and ideology, sometimes due to the practical needs of invention notifications, this area needs further第二课时 两位数减两位数的口算
教学内容：教科书第61页-62页例2和“想想做做”第1-5题。 教学目标：
1．使学生经历两位数减两位数口算方法的探索过程，体验不同算法间的联系，整合并掌握两位数减两位数的口算方法，能正确口算两位数减两位数的差。
2．培养发现问题、提出问题的初步能力；感受探索口算方法的不同策略，发展初步的分析、比较和抽象、概况等思维能力；体验新旧间的联系。
3．使学生主动参与思考、交流等活动，产生对数学学习的兴趣，初步培养与同伴合作、交流的意识；感受探索口算方法的成功感，提升学习数学的自信心。
教学重点：
掌握两位数减两位数的口算方法。
教学难点：
理解两位数减两位数的口算方法。 教具准备： 课件
教学过程：
二、先学探究 1．口算。
24+45 12+75 36+18 20—7 24+49 15+75 55+18 50—20 说说“36+18和20—7”的口算方法。 2．先估计得数是几十多，再口算。 23+52 35+14 69+13 54+17 说说估算方法。 二、交流共享 教学例2。
出示教材情境图：你从图中得到了哪些信息？你们提出哪些用减法计算的问题？怎样列式？
根据学生的回答板书：（不退位的）56—24 （退位的）56—27 这节课我们研究两位数减两位数的口算方法。（板书课题）
你能口算出这些算式的得数吗？到小组里说说自己口算的方法，再听别人的算法。
全班交流。重点放在退位减上，多让学生说一说。 比较：上面两组题在计算时有什么异同？
streamlining. Four are standard visits, except as required to participate in training, no other activity. Five is to improve news reporting, for propaganda work strictly according to the regulations. Six is strictly your presentation published strictly according to the regulations. Seven is strictly thrift, required the use of vehicles and office space and corporate hospitality. 3, change the style. Propaganda and ideological work of the new situation and new requirements of the new tasks, had done a lot of fruitful work, has made many achievements, but further closer to the grass roots, close to reality, close to the masses and also inadequate innovation must continue to improve. Second, the \s 1, oppose formalism. One theory is that he didn't, with less close contact. Theoretical study of consciousness is not high enough, system performance s not strong enough; more passive learning, active learning few generalities and learn more, delving into less. Especially based on rational thinking on major issues, applying theory to guide the work done is not good enough, not really understand and grasp the spirit and essence of the scientific Outlook on development, did not truly achieve mastery, to apply, to a certain extent, affect the development and implementation of ideas and initiatives. Second, work arrangements, and less supervision. Propaganda and ideological work is the objective, which needs to keep the continuity efforts deployed, but stressed in the work time, less supervision. For example, color weekends in the summer theatrical activities, city square performances, urging townships, communities and rural areas shows the implementation is inadequate, insufficient cultural an educational role to play. Third base enough, master grass-less real. Propaganda and ideological work in the new situation of characteristics and regularity of enough, deep enough for grass-roots public opinion Dynamics survey, for grass-roots typically driveless. For example, rural culture team active, ... I'm not actively take the initiative to take up, the lack of spirit of daring to, resulting in some job had a lot of power, but no tangible results. Third, innovation, lack of motivation. Emancipation did not end, innovation does not exist. In practical work, not your head, previous work experience, lack of innovation initiatives, study on the characteristics of propaganda and ideological work under the new situation through, grip on grassroots ideological trends and changes are not deep, to promote new initiatives and explore new methods of ideological and cultural work is not much, and some lack of relevance and timeliness. 4, discipline, lowering, and hard work are lacking. While working and enterprising spirit down. No real solution to treat yourself right, correctly treat past honors, their complacency, and work to see their scores more, less checking his own shortcomings, like to listen to the praise, satisfied face, online promotion, there artypical, and lack of high standards and strict requirements, the effect is real. Second hard drive less. On hard and