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分数的简单计算

小学数学第五册. 分数的简单计算. 执教者: gjq. 8. 里面有( ) 个. 5. 里面有( ) 个. 3. 里面有( ) 个. 1. 2. 5. 5. 熊妈妈买了一个大蛋糕, 熊哥哥吃了这个蛋糕的 , 熊弟弟吃了蛋糕的 。. 熊哥哥和熊弟弟一共吃了蛋糕的几分之几?. 2. 1. 3. =. 5. 5. 5. +. 1. 5. 6. 6. +. +. 1. 5. 6. 6. +. +. 1. 5. 6. 6. +. +. =. 1. 5. 6. 6. 6.

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分数的简单计算

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  1. 小学数学第五册 分数的简单计算 执教者:gjq

  2. 8 里面有( ) 个 5 里面有( )个 3 里面有( )个

  3. 1 2 5 5 熊妈妈买了一个大蛋糕, 熊哥哥吃了这个蛋糕的 , 熊弟弟吃了蛋糕的 。 熊哥哥和熊弟弟一共吃了蛋糕的几分之几?

  4. 2 1 3 = 5 5 5 +

  5. 1 5 6 6 + +

  6. 1 5 6 6 + +

  7. 1 5 6 6 + +

  8. = 1 5 6 6 6 6 + + = 1

  9. = 2 1 6 3 1 5 = 5 5 5 6 6 6 + + = 1 仔细观察,你发现了什么? 分子加分子做新的分子,分 母不变。

  10. 1 7 2 5 3 2 3 6 6 4 1 4 2 3 4 5 1 3 5 8 9 5 9 7 7 7 5 6 7 8 7 6 8 7 6 9 看谁算得又对又快。 + = + = + = + = + = + = =1

  11. 1 2 5 5 熊妈妈买了一个大蛋糕, 熊哥哥吃了这个蛋糕的 , 熊弟弟吃了蛋糕的 。 熊哥哥比熊弟弟多吃了蛋糕的几分之几?

  12. 2 1 1 1 = 5 5 5 5 -

  13. 1 1 1 3 6 6 6 6 3 6 3

  14. = 2 3 2 1 5 1 = 6 5 6 5 6 5 - - 仔细观察,你发现了什么? 分子减分子做新的分子,分母不变。

  15. = - 1 ? 7 6 4 3 5 6 8 1 2 1 3 2 4 3 1 1 7 8 9 9 8 8 7 7 10 6 6 10 9 6 4 10 看谁算得又对又快。 = = - - = = - - = -

  16. 1 1 - - =? = = - 1为什么可以看作 ? 4 1 1 4 1 3 4 4 4 4 4 4 “1”还可以看作几分之几 ? 100

  17. 1 2 5 5 熊妈妈做了一个蛋糕, 熊哥哥吃了这个蛋糕的 , 熊弟弟吃了蛋糕的 。 这个蛋糕还剩下几分之几呢? 书99

  18. _ = _ = 1 3 3 2 1 5 3 2 = 5 5 5 5 5 5 5 +

  19. 考考你 ( )+( )= 6 7

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