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【321105】【课时练】第1单元 分数乘法 7 用分数乘法解决实际问题-六年级上册数学一课一练(人教

时间:2025-01-08 19:23:51 作者: 字数:4898字
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7  用分数乘法解决实际问题

本课导学

本课知识点:初步掌握分数乘法应用题的数量关系,学会应用一个数乘以分数的意义解答分数乘法一步应用题。

一根绳子长36米,第一次用去 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a> ,第二次用去 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a> 米,问还剩下多少米?


特别提醒:知道求一个数的几分之几用乘法。抓住知识关键,正确、灵活判断单位“1”

【快乐训练营】

一、想一想,填一填。

1. (5)班男生的人数占全班人数的 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a> <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a> 表示把( )看作单位“1”,平均分成( )份,男生占其中的(  )份;女生占其中的(  )份,女生占全班人数的(   )。

  2. 一条路,修了 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a> ,表示把(   )看作单位“1”,平均分成( )份,修完的占这样的(  )份,剩下的占(   )份。

3.降价了 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a> ,表示( )是( )的 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a> ,“1 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a> ”表示( )。

4.小明的邮票比小东多 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a> ,“1+ <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a>表示( ),要求小明的邮票,就是求( )的( )是多少。

二、找出看作单位“1”的量,看谁找得准。

1.甲是乙的 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a> 。         

表示单位“1”的量是(     )

  2.爸爸年龄的 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a> 是妈妈的年龄。  

表示单位“1”的量是(     )

3.黑兔只数的 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a> 相当于白兔的只数。

表示单位“1”的量是(     )

4.一桶油用去了 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a> 。       

表示单位“1”的量是(     )

三、照样子,写一写。

例:一本书看了 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a> 。     

关系式:一本书的页数× <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a> =看了的页数

1.苹果的质量是梨的 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a> 。     

关系式:            

2.大象高度的 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a> 相当于老虎的高度。

关系式:            

  3.一根绳子,用去了 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a> 。     

关系式:            

四、根据算式补充问题。

修一条34千米的公路,第一周修了 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a> ,第二周修了 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a> ,____?

1.34× <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a> ,问题是_______

2.34× <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a> + <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a> ),问题是_______

3.34× <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a> <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a> ),问题是_______

4.34×1 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a> <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a> ),问题是_______

【知识加油站】

  1. 看图列式。

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a>

 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a>

六、补充条件或问题,使之成为一步解答的分数乘法应用题并解答。

1. 一袋大米100千克,吃了 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a>              



2.水果店运进400千克香瓜,        ,卖出了多少千克?



3.同学们要植120棵树,第一天植了总数的 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a> ,第二天植了总数的 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a>         ?或         




七、解决问题。

1.一头鲸长28米,一个人的身高是鲸体长的 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a> 。这个人的身高是多少米?





  1. 为举行校庆,六(2)班要做180面小旗,已经做了 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a> ,还有多少面没有做?




  3.爸爸的身高是180厘米,小刚的身高是爸爸的 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a> ,小刚的身高是多少厘米?




4.一辆汽车每小时行驶80千米,从甲地到乙地共行驶了 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a> 小时。甲、乙两地相距多少千米?





5.妈妈买一件上衣花了320元钱,买裤子的钱是上衣的 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a> ,买皮鞋的钱是裤子的 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a> 。妈妈买皮鞋花了多少元钱?




6.有甲、乙两个书架,甲书架有书300本,若把甲书架书的 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a> 放到乙书架,则甲、乙两个书架的书的本数相等。乙书架原来有书多少本?





【我来纠错】















参考答案

一、1.全班人数 8 5 3  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a>

2. 一条路 5 2 3

3.降低的价格 原价 1减去 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a>

4.小明的邮票 1  <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a>

二、1. 2. 爸爸年龄 3. 黑兔只数 4.一桶油

三、1. 苹果的质量× <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a> =梨的质量。     

2. 大象高度× <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a> =老虎的高度。

  3. 一根绳子× <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a> =用去的绳子。     

四、1. 第二周修了多少千米?

2.两周共修了全长的多少米?

3.第一周比第二周多修了多少千米?

4.两周后还剩下多少千米?

五、1.480× <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a> =400(元) 2.160-160× <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a> =140(朵) 140-140× <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a> =112(朵)

六、1. 100-100× <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a> =40kg) 还剩下多少千克?

  1. 400× <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a> =150kg卖了总数的 <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a>

3.第一天比第二天多植树多少棵?120× <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a> -120× <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a> =20(棵)

两天一共植树多少棵? 120× <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a> +120× <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a> =100(棵)

七、1.28× <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a> = <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a> m

2.180-180× <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a> =30(面)

3. 180× <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a> =140cm

4.80× <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a> =64km

5.320× <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a> =240(元) 240× <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a> =200(元)

6.300-300× <a href="/tags/1/" title="单元" class="c1" target="_blank">单元</a> <a href="/tags/16/" title="课时" class="c1" target="_blank">课时</a> <a href="/tags/47/" title="解决" class="c1" target="_blank">解决</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/144/" title="分数" class="c1" target="_blank">分数</a> <a href="/tags/195/" title="乘法" class="c1" target="_blank">乘法</a> =250(本)






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