最新苏教版三年级数学下册第二、三单元_教案

letters and calls, and do practical things for the masses combine good, effective through reaching people at the service of the \hird, foster the development of new energy, new General Secretary XI Jinping stressed development of innovation forest restructuring, revitalization of the old industrial bases in Northeast China is the State's major strategy, Central has issued comprehensive opinions of revitalizing Northeast China and other old industrial bases, the CPC Central Committee on revitalization in Northeast China were ... Vigorous determination does not waver, the work does not slacken off. Be firm with in the development has more to do with hard, and not muddle along, passive inaction. To rely on their own efforts, can't wait, can't wait, stand still. This not only provides new opportunities for development in our region, and gave us new requirements. We must seize the opportunity, full use of national policy, has to be more complicated, to start and target, give full play to theinitiative of leading cadres at all levels, active, active, focusing on building new momentum for development, accelerating transformation of forest development. To implement the new development philosophy. Philosophy is the action guide, new ideas and new developments. Carrying out innovation, coordination and development of green, open, shared ideas, must be measurable, direct action with new development concepts, training cadres. In a new development concept as a yardstick. Established in line with the new concept of evaluation system and evaluation criterion, embodies the new development policy, organization, mandate implementation, always measured by the new development philosophy, continuous correction of forest transition course. In a new development concept for the path command. As part of the implementation of the new development philosophy followed and action guidelines, firmly adjusted, corrected and reject unsuitable, inappropriate and even againstthe new development ideas, behaviors and practices, more pragmatic approach based on a broad vision, and creatively carry out ecological construction, industrial development, improving people's livelihood, such as the work to ensure that new development ideas take root in forest areas. In a new development concept for weapon training cadre. Education leaders \he new, nothing\es, enhancing vitality and power. Combined development \nd implementation \engineering\nd create \nvironment\hening on new development, and new economy concept of learning, and grasp and using, real put thought and action unified to new development concept up, at with new development concept armed himself, and guide practice, effective do advocate innovation, and focused on coordination, and advocate green, and thick plant open, and advance shared. Second, we must rely on Science and technology affects. Tchnical innovation is the promotion of economic transformation and upgrading, quality and efficiency \er\3.比较：上面两题有什么相同，有什么不同？解答的过程呢？（学生讨论） 指名回答，教师适时引导。 相同点：（1）已知条件相同，问题不同。（2）都可以根据问题分析数量关系，确定先算什么。（3）题中的数量关系不同，解题的方法也不同。（4）上衣的价格不知道，都要先算买一件上衣多少元。 三、反馈完善 1.完成教材第31页“想想做做”第1题。 让学生读线段图，根据问题说出数量关系式，并说说各可以先算什么。 2.完成教材第31页“想想做做”第2题。 让学生阅读小芸和小力的话，并说说从中获得的信息。 学生独立填表，完成后可以与同桌交流自己的解题思路。 ？元 教师巡视，适时进行引导。 3.完成教材第31页“想想做做”第3题。 先指名说说所求的问题是什么，数量关系是什么，让学生在练习本上画出线段图，表示出已知条件和所求问题。再让学生说说先算什么，再算什么，然后让学生独立计算。最后集体交流订正。 四、反思总结 通过本课的学习，你有什么收获？ 还有哪些疑问？ 教学反思： ivelihood, is related to people's well-being and social harmony and stability. We need to protect and improve the livelihood of the people as the starting point and ending point of transition and improve forest people's feeling and happiness. To promote poverty relief and development work. Implementing poverty alleviation crucial project is a major strategic decision made by the CPC Central Committee, is also determined by the provincial \nking and action to the requirements of the Central, provincial, resolutely win the poverty battle. The previous phase I to 18 stations, Tahe, Pine Ridge research, visited many of the poor, go, the heavier, more pressure. For poverty relief and development work, we must pay attention to it, always in mind, grasping hands, should not be blindly optimistic, there can be no slack. Poverty alleviation and development lies in precise, accurate. Present, in order to find out the real base of poor people as soon as possible, come up with feasible poverty standards, state card, built on the basis of document management. To firmly establish the \poverty reduction\he intensity of resource integration, and related funding, with limited funds wisely. By using a combination of employment, entrepreneurship for poverty eradication poverty eradication, education, poverty alleviation, medical aid of poverty means, due to effects of policies, those policies, ensure the completion of mission objectives for poverty eradication for the year. To actively promote the construction of new towns. In February this year, promulgated by the State Council on further promoting urbanization construction of new opinions, proposed to adhere to the people-centered, four modernizations synchronization, optimization, ecology civilization and cultural heritage of new urbanization path with Chinese characteristics. According to district-wide construction of civilized city and the beautiful countryside, further strengthening of urban transport, water supply and drainage and sewage, waste disposal ground, underground, such as infrastructure construction, strive to create a safer and more livable environment. To actively seize the full stop and opportunities for poverty alleviation and development, further efforts to increase forest villages merge, population to the County (district) Council sites and centres concentrated in villages and towns. Combined development of urban construction and tourism industries, careful planning and construction of a number of suitable for residential and farm tour towns and villages, forming one village one product, a feature pattern. Closer to the masses. Since last year, our in-depth implementation of the leading cadres of grassroots masses at work, solve the problems of a large number of people, get the masses give wholehearted support to and praise, this work will carry on, absolutely cannot or movement. Grassroots masses and cadres in combination with poverty reduction, combined with the steady work ofletters and calls, and do practical things for the masses combine good, effective through reaching people at the service of the \hird, foster the development of new energy, new General Secretary XI Jinping stressed development of innovation forest restructuring, revitalization of the old industrial bases in Northeast China is the State's major strategy, Central has issued comprehensive opinions of revitalizing Northeast China and other old industrial bases, the CPC Central Committee on revitalization in Northeast China were ... Vigorous determination does not waver, the work does not slacken off. Be firm with in the development has more to do with hard, and not muddle along, passive inaction. To rely on their own efforts, can't wait, can't wait, stand still. This not only provides new opportunities for development in our region, and gave us new requirements. We must seize the opportunity, full use of national policy, has to be more complicated, to start and target, give full play to theinitiative of leading cadres at all levels, active, active, focusing on building new momentum for development, accelerating transformation of forest development. To implement the new development philosophy. Philosophy is the action guide, new ideas and new developments. Carrying out innovation, coordination and development of green, open, shared ideas, must be measurable, direct action with new development concepts, training cadres. In a new development concept as a yardstick. Established in line with the new concept of evaluation system and evaluation criterion, embodies the new development policy, organization, mandate implementation, always measured by the new development philosophy, continuous correction of forest transition course. In a new development concept for the path command. As part of the implementation of the new development philosophy followed and action guidelines, firmly adjusted, corrected and reject unsuitable, inappropriate and even againstthe new development ideas, behaviors and practices, more pragmatic approach based on a broad vision, and creatively carry out ecological construction, industrial development, improving people's livelihood, such as the work to ensure that new development ideas take root in forest areas. In a new development concept for weapon training cadre. Education leaders \he new, nothing\es, enhancing vitality and power. Combined development \nd implementation \engineering\nd create \nvironment\hening on new development, and new economy concept of learning, and grasp and using, real put thought and action unified to new development concept up, at with new development concept armed himself, and guide practice, effective do advocate innovation, and focused on coordination, and advocate green, and thick plant open, and advance shard. Second, we must rely on Science and technology affects. Tchnical innovation is the promotion of economic transformation and upgrading, quality and efficiency \er\ 第三单元 解决问题的策略 总第 16 课时 课 题 练习四 课 时 第 3 课时 练习 课 型 1.通过练习，使学生在解决实际问题的过程中，灵活运用合适的策略整教学目标： 理相关信息，感受画线段图是解决问题的一种常用策略。 2.通过观察、交流、迁移等活动，提高学生运用策略解决实际问题的能力。 教学重点：综合运用知识解决问题，感受运用策略整理信息的必要性，重点难点： 提高运用策略的能力。 教学难点：综合运用知识解决问题。 板书设计： 教 学 过 程 二 次 备 课 一、知识再现 本单元我们学习了借助从问题想起和画线段图的策略解决两步计算的实际问题。本节课我们将对本单元的知识进行复习。 完成教材第32页“练习四”第1题。 （1）出示题目，让学生根据问题说出数量之间的关系，确定先算什么。 分析：①还剩的米数等于总长度减去已修的米数；②求还剩的米数，等于总长度减去8天修的米数。 指名列式解答，师板书： 已修的米数：45×8=360（米） 还剩的米数：520－360=160（米） （2）出示线段图，让学生先说说这道题的已知条件和所求问题。然后说出问题的数量关系，确定先算什么，再算什么。最后指名列式解答。 面粉的袋数：60－22=38（袋） ivelihood, is related to people's well-being and social harmony and stability. We need to protect and improve the livelihood of the people as the starting point and ending point of transition and improve forest people's feeling and happiness. To promote poverty relief and development work. Implementing poverty alleviation crucial project is a major strategic decision made by the CPC Central Committee, is also determined by the provincial \nking and action to the requirements of the Central, provincial, resolutely win the poverty battle. The previous phase I to 18 stations, Tahe, Pine Ridge research, visited many of the poor, go, the heavier, more pressure. For poverty relief and development work, we must pay attention to it, always in mind, grasping hands, should not be blindly optimistic, there can be no slack. Poverty alleviation and development lies in precise, accurate. Present, in order to find out the real base of poor people as soon as possible, come up with feasible poverty standards, state card, built on the basis of document management. To firmly establish the \poverty reduction\he intensity of resource integration, and related funding, with limited funds wisely. By using a combination of employment, entrepreneurship for poverty eradication poverty eradication, education, poverty alleviation, medical aid of poverty means, due to effects of policies, those policies, ensure the completion of mission objectives for poverty eradication for the year. To actively promote the construction of new towns. In February this year, promulgated by the State Council on further promoting urbanization construction of new opinions, proposed to adhere to the people-centered, four modernizations synchronization, optimization, ecology civilization and cultural heritage of new urbanization path with Chinese characteristics. According to district-wide construction of civilized city and the beautiful countryside, further strengthening of urban transport, water supply and drainage and sewage, waste disposal ground, underground, such as infrastructure construction, strive to create a safer and more livable environment. To actively seize the full stop and opportunities for poverty alleviation and development, further efforts to increase forest villages merge, population to the County (district) Council sites and centres concentrated in villages and towns. Combined development of urban construction and tourism industries, careful planning and construction of a number of suitable for residential and farm tour towns and villages, forming one village one product, a feature pattern. Closer to the masses. Since last year, our in-depth implementation of the leading cadres of grassroots masses at work, solve the problems of a large number of people, get the masses give wholehearted support to and praise, this work will carry on, absolutely cannot or movement. Grassroots masses and cadres in combination with poverty reduction, combined with the steady work ofletters and calls, and do practical things for the masses combine good, effective through reaching people at the service of the \hird, foster the development of new energy, new General Secretary XI Jinping stressed development of innovation forest restructuring, revitalization of the old industrial bases in Northeast China is the State's major strategy, Central has issued comprehensive opinions of revitalizing Northeast China and other old industrial bases, the CPC Central Committee on revitalization in Northeast China were ... Vigorous determination does not waver, the work does not slacken off. Be firm with in the development has more to do with hard, and not muddle along, passive inaction. To rely on their own efforts, can't wait, can't wait, stand still. This not only provides new opportunities for development in our region, and gave us new requirements. We must seize the opportunity, full use of national policy, has to be more complicated, to start and target, give full play to theinitiative of leading cadres at all levels, active, active, focusing on building new momentum for development, accelerating transformation of forest development. To implement the new development philosophy. Philosophy is the action guide, new ideas and new developments. Carrying out innovation, coordination and development of green, open, shared ideas, must be measurable, direct action with new development concepts, training cadres. In a new development concept as a yardstick. Established in line with the new concept of evaluation system and evaluation criterion, embodies the new development policy, organization, mandate implementation, always measured by the new development philosophy, continuous correction of forest transition course. In a new development concept for the path command. As part of the implementation of the new development philosophy followed and action guidelines, firmly adjusted, corrected and reject unsuitable, inappropriate and even againstthe new development ideas, behaviors and practices, more pragmatic approach based on a broad vision, and creatively carry out ecological construction, industrial development, improving people's livelihood, such as the work to ensure that new development ideas take root in forest areas. In a new development concept for weapon training cadre. Education leaders \he new, nothing\es, enhancing vitality and power. Combined development \nd implementation \engineering\nd create \nvironment\hening on new development, and new economy concept of learning, and grasp and using, real put thought and action unified to new development concept up, at with new development concept armed himself, and guide practice, effective do advocate innovation, and focused on coordination, and advocate green, and thick plant open, and advance shared. Second, we must rely on Science and technology affects. Tchnical innovation is the promotion of economic transformation and upgrading, quality and efficiency \er\一共的袋数：60+38=98（袋） 二、基本练习 1.完成教材第32页“练习四”第2题。 （1）让学生阅读题目的已知条件，说说你知道了什么。 （2）让学生说出数量关系，画出线段图，确定先算什么，再算什么，并列式解答。师板书。 （3）提问：要求楼下比楼上多多少个座位，我们必须知道什么条件？你能将上题的线段图改一改吗？师板书。 追问：什么变了？什么不变？数量关系变了吗？先算什么，再算什么？ 3.完成教材第33页“练习四”第7题。 提问：从问题想起，要求平均每分钟走多少米，缺少什么条件？ 出示两幅情境图，让学生讨论： ①你能看懂两幅图吗？小宁走到的地方一样吗？ ②小宁走了多少米？ 600－300=300（米） ③怎样求平均每分钟走多少米？ 300÷5=60（米） 4.完成教材第33页“练习四”第8题。 出示问题（1），并提问：从问题开始，要求一共缴纳的水费，数量关系式是什么？先算什么？再算什么？ 出示问题（2），让学生仔细读题，说出数量关系，再列式解答。 三、综合练习 1.完成教材第32页“练习四”第4题。 解决问题（1）：让学生先读题，从问题想起，说说数量关系，画出线段图，再列式解答。 解决问题（2）：在问题（1）的基础上，说出数量关系，更改线段图，再列式解答。 2.完成教材第32页“练习四”第5题。 提问：这两题的问题是什么？数量关系是什么？解题过程相同吗？为什么？ 学生列式解答，并反馈交流： （1）32×3=96（页） 150－96=54（页） ivelihood, is related to people's well-being and social harmony and stability. We need to protect and improve the livelihood of the people as the starting point and ending point of transition and improve forest people's feeling and happiness. To promote poverty relief and development work. Implementing poverty alleviation crucial project is a major strategic decision made by the CPC Central Committee, is also determined by the provincial \nking and action to the requirements of the Central, provincial, resolutely win the poverty battle. The previous phase I to 18 stations, Tahe, Pine Ridge research, visited many of the poor, go, the heavier, more pressure. For poverty relief and development work, we must pay attention to it, always in mind, grasping hands, should not be blindly optimistic, there can be no slack. Poverty alleviation and development lies in precise, accurate. Present, in order to find out the real base of poor people as soon as possible, come up with feasible poverty standards, state card, built on the basis of document management. To firmly establish the \poverty reduction\he intensity of resource integration, and related funding, with limited funds wisely. By using a combination of employment, entrepreneurship for poverty eradication poverty eradication, education, poverty alleviation, medical aid of poverty means, due to effects of policies, those policies, ensure the completion of mission objectives for poverty eradication for the year. To actively promote the construction of new towns. In February this year, promulgated by the State Council on further promoting urbanization construction of new opinions, proposed to adhere to the people-centered, four modernizations synchronization, optimization, ecology civilization and cultural heritage of new urbanization path with Chinese characteristics. According to district-wide construction of civilized city and the beautiful countryside, further strengthening of urban transport, water supply and drainage and sewage, waste disposal ground, underground, such as infrastructure construction, strive to create a safer and more livable environment. To actively seize the full stop and opportunities for poverty alleviation and development, further efforts to increase forest villages merge, population to the County (district) Council sites and centres concentrated in villages and towns. Combined development of urban construction and tourism industries, careful planning and construction of a number of suitable for residential and farm tour towns and villages, forming one village one product, a feature pattern. Closer to the masses. Since last year, our in-depth implementation of the leading cadres of grassroots masses at work, solve the problems of a large number of people, get the masses give wholehearted support to and praise, this work will carry on, absolutely cannot or movement. Grassroots masses and cadres in combination with poverty reduction, combined with the steady work ofletters and calls, and do practical things for the masses combine good, effective through reaching people at the service of the \hird, foster the development of new energy, new General Secretary XI Jinping stressed development of innovation forest restructuring, revitalization of the old industrial bases in Northeast China is the State's major strategy, Central has issued comprehensive opinions of revitalizing Northeast China and other old industrial bases, the CPC Central Committee on revitalization in Northeast China were ... Vigorous determination does not waver, the work does not slacken off. Be firm with in the development has more to do with hard, and not muddle along, passive inaction. To rely on their own efforts, can't wait, can't wait, stand still. This not only provides new opportunities for development in our region, and gave us new requirements. We must seize the opportunity, full use of national policy, has to be more complicated, to start and target, give full play to theinitiative of leading cadres at all levels, active, active, focusing on building new momentum for development, accelerating transformation of forest development. To implement the new development philosophy. Philosophy is the action guide, new ideas and new developments. Carrying out innovation, coordination and development of green, open, shared ideas, must be measurable, direct action with new development concepts, training cadres. In a new development concept as a yardstick. Established in line with the new concept of evaluation system and evaluation criterion, embodies the new development policy, organization, mandate implementation, always measured by the new development philosophy, continuous correction of forest transition course. In a new development concept for the path command. As part of the implementation of the new development philosophy followed and action guidelines, firmly adjusted, corrected and reject unsuitable, inappropriate and even againstthe new development ideas, behaviors and practices, more pragmatic approach based on a broad vision, and creatively carry out ecological construction, industrial development, improving people's livelihood, such as the work to ensure that new development ideas take root in forest areas. In a new development concept for weapon training cadre. Education leaders \he new, nothing\es, enhancing vitality and power. Combined development \nd implementation \engineering\nd create \nvironment\hening on new development, and new economy concept of learning, and grasp and using, real put thought and action unified to new development concept up, at with new development concept armed himself, and guide practice, effective do advocate innovation, and focused on coordination, and advocate green, and thick plant open, and advance shard. Second, we must rely on Science and technology affects. Tchnical innovation is the promotion of economic transformation and upgrading, quality and efficiency \er\（2）40+32=72（页） 150－72=78（页） 3.完成教材第33页“练习四”第10题。 出示题目，让学生读一读，并提问：怎么比？（求出每袋多少元） 让学生先计算，再汇报交流。 4.完成教材第33页“练习四”思考题。 让学生读题，并用线段图表示出已知条件和所求问题。 师讲解：从线段图中分析，妈妈比小芳多出的27岁，正好是小芳岁数的3倍，小芳的年龄是27÷3=9（岁），妈妈是9×4=36（岁）。 四、反思总结 通过本课的学习，你有什么收获？ 你能用学会的知识解决我们身边的问题吗？ 五、课堂作业 《补》 教学反思：

ivelihood, is related to people's well-being and social harmony and stability. We need to protect and improve the livelihood of the people as the starting point and ending point of transition and improve forest people's feeling and happiness. To promote poverty relief and development work. Implementing poverty alleviation crucial project is a major strategic decision made by the CPC Central Committee, is also determined by the provincial \nking and action to the requirements of the Central, provincial, resolutely win the poverty battle. The previous phase I to 18 stations, Tahe, Pine Ridge research, visited many of the poor, go, the heavier, more pressure. For poverty relief and development work, we must pay attention to it, always in mind, grasping hands, should not be blindly optimistic, there can be no slack. Poverty alleviation and development lies in precise, accurate. Present, in order to find out the real base of poor people as soon as possible, come up with feasible poverty standards, state card, built on the basis of document management. To firmly establish the \poverty reduction\he intensity of resource integration, and related funding, with limited funds wisely. By using a combination of employment, entrepreneurship for poverty eradication poverty eradication, education, poverty alleviation, medical aid of poverty means, due to effects of policies, those policies, ensure the completion of mission objectives for poverty eradication for the year. To actively promote the construction of new towns. In February this year, promulgated by the State Council on further promoting urbanization construction of new opinions, proposed to adhere to the people-centered, four modernizations synchronization, optimization, ecology civilization and cultural heritage of new urbanization path with Chinese characteristics. According to district-wide construction of civilized city and the beautiful countryside, further strengthening of urban transport, water supply and drainage and sewage, waste disposal ground, underground, such as infrastructure construction, strive to create a safer and more livable environment. To actively seize the full stop and opportunities for poverty alleviation and development, further efforts to increase forest villages merge, population to the County (district) Council sites and centres concentrated in villages and towns. Combined development of urban construction and tourism industries, careful planning and construction of a number of suitable for residential and farm tour towns and villages, forming one village one product, a feature pattern. Closer to the masses. Since last year, our in-depth implementation of the leading cadres of grassroots masses at work, solve the problems of a large number of people, get the masses give wholehearted support to and praise, this work will carry on, absolutely cannot or movement. Grassroots masses and cadres in combination with poverty reduction, combined with the steady work of