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简单分数的加减法

苏教版三年级数学上册课件. 简单分数的加减法. 分母相同的分数相加的方法怎样？. 分母不变，分子相加. + =. 1. 3. 1. 1. 2. 4. 1. 5. + =. + =. + =. 7. 3. 6. 9. 9. 3. 7. 6. 分母相同的分数相减的方法怎样？. 分母不变，分子相减. 9. - =. - =. 10. 10. 10. 3. - =. - =. 4. 4. 12. 12. 4.

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简单分数的加减法

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  1. 苏教版三年级数学上册课件 简单分数的加减法

  2. 分母相同的分数相加的方法怎样？ 分母不变，分子相加

  3. + = 1 3 1 1 2 4 1 5 + = + = + = 7 3 6 9 9 3 7 6

  4. 分母相同的分数相减的方法怎样？ 分母不变，分子相减

  5. 9 - = - = 10 10 10 3 - = - = 4 4 12 12 4 2 1 2 2 5 5

  6. 课桌宽 米，长比宽多 米，课桌 长多少米？ 2 5 3 7 10 10 8 8 课桌长 米，比宽多 米，课桌宽 多少米？

  7. 修一条路，第一天修了 ，第二天修了 ，你能提出什么问题？ 1 4 6 6

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