五年级数学上册第3单元《小数除法》除数是整数的小数除法导学案2(无答案)新人教版.doc

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1、1除数是整数的小数除法学习目标:1、进一步掌握除数是整数的小数除法计算法则,正确熟练计算除数是整数的小数除法的计算。2、探索并发现小数除以整数的计算中几种特殊情况的处理方法。3、激发学生学习热情、高 度责任、自动自发、享受成功。学习重点:正确计算除数是整数的小数除法。学习难点:小数除以整数的计算中几种特殊情况的处理方法。温习旧知1、 快乐口算。4.23= 7.26= 2.82= 6.33=16.88= 5.55= 4.84= 3.82=2、笔算,并结合竖 式说说 你是怎样算的。93.624= 117.525=3、 不改变数的大小,把下面各数改写成三位 小数。2.4= 117= 5= 18=我是

2、根据( )把上面各数改写成三位小数的。一.自主学习与合作探究自学教材第 25 页的例 2(1)读题,理解题意并列式:( )(2)观察竖式并想:按( )法则去除,余数是( ),表示余 ( ) 个 1;在 ( )的后面添 0,表示( )个十分之一后继续除,同 时在( ) 和( )的后面点上小数点,余数是( ),表示 ( )个十分之一;再在( )后面添 0,表示( )个百分之一后继续 除.(3)尝试独立用竖式计算.重点提示:商的小数点和 被 除 数的小数点要对齐.2(4)练一练:7215= 294=(5)交流、小结:小数除以整数,如果除到被除数的末位还有余数,要在( )整数部分的后面点上( ),在余

3、数后面添( ),继续除.2、自学教材第 25 页的例 3:(1)独立分析,列出算式。 ( ) (2)想:先用 5.6 的整数部分 5 除以 7, ( ) ,要在被除数( )位数字 5 的上面商( ) ,对齐被除数的小数点点上商的小数点,再继续往下除,56 个十分之一除以 7 等于( )个十分 之一,在商的十分位上写( ).(3)尝试独立用竖式计算.(4)练一练:7.839= 4.088= 0.546=(5)我发现:小数除以整数,如果小数的整数部分不够除,在个位上商( ),点上商的( )后继续除.3、口头整理一下小数除以整数的计算方法。二、达标测评1、口算。205= 2.43= 0.369= 3.333=6.55= 0.567= 7.28= 45=2、计算。6237 0 486 75683624 36 15 182463*4. 1.2618=三、整理学案

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