北京版小学数学四年级下册全册教案.doc

PAGE 3 北京版小学数学四年级下册全册教案 目录 一 小数《小数的意义和性质》·········································3 一 小数《小数比大小》·················································10 一 小数《小数的改写与近似数》······································16 二 小数加、减法《两位小数加减法》·································19 三 平行与相交《认识平行线》·········································26 三 平行与相交《认识垂线》············································31 四 图形变换《平移和旋转》············································37 四 图形变换《轴对称图形》············································41 四 图形变换《观察物体》···············································46 五 解决问题《相遇问题》···············································51 五 解决问题《实践活动“周末一日游”旅游计划》·················56 六 生活中的负数《负数的认识》·······································61 七 统计表《平均数》····················································66 八 数学百花园《乒乓球与盒子》·······································75 八 数学百花园《和差问题》············································83 九 总复习《小数》······················································92 九 总复习《小数加减法》··············································97 九 总复习《平行与相交》··············································104 九 总复习《解决问题》················································112 九 总复习《生活中的负数》············································115 九 总复习《问题与思考》··············································122 一 小数《小数的意义和性质》 1教学目标 1.知识与技能使学生了解小数的产生,理解小数的意义,认识小数的计数单位及单位间的进率。会将分母是10、100、1000的分数化成小数。?2.过程与方法 学生通过动手操作、观察、比较等活动经历小数意义的形成过程,学习探索新知识的方法,培养学生抽象概括的能力和迁移能力,渗透类推的数学方法。?3.情感态度价值观体会小数在生活中的作用。结合拓展资料,培养学生民族自豪感。? 2学情分析 学生通过动手操作、观察、比较等活动经历小数意义的形成过程,学习探索新知识的方法,培养学生抽象概括的能力和迁移能力,渗透类推的数学方法。 3重点难点 教学重点 ??理解小数的意义,认识小数的计数单位及单位间的进率。? 教学难点? ??抽象概括得出小数意义的过程。? 4教学过程 4.1第一学时 4.1.1教学活动 活动1【导入】小数的意义教学设计 教学过程(一)小数的产生?1.活动:学生动手测量自己课桌的长是多少米。?2.汇报:是7分米3.如果用米做单位是多少米?(学生根据已有知识会答出 米)?4.小结:在进行测量和计算时,往往不能得到整数的结果,这时常用小数来表示。?【视频3】(动画1)?今天我们就来深入的认识一下小数。?(二)探索小数的意义?1.教师引领,学习一位小数的意义?(1)把1米平均分成10份,请在米尺上找到1份,是多长?(1分米)?? ? 1分米是几分之几米?( 米)?(动画2)?? ? 为什么1分米是 米?(把1米平均分成10份,其中的1份就是1分米,也就是 米)?(2)师: 米还可以用小数表示是0.1米 , 米与0.1米的意思相同,就是表示的形式不同。??