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20 以内的退位减法

20 以内的退位减法. 十几减 7 、 6. 绿色圃中小学教育网 http://www.lspjy.com. 口 算:. 11 - 9 =. 2. 11 - 8 =. 3. 13 - 9 =. 4. 16 - 9 =. 7. 12 - 8 =. 4. 14 - 8 =. 6. 15 - 9 =. 6. 15 - 8 =. 7. 17 - 9 =. 8. 16 - 8 =. 8. 18 - 9 =. 9. 绿色圃中小学教育网 http://www.lspjy.com. 问题:同学们算得又对又快,能说说你们是用什么方法算的吗?.

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20 以内的退位减法

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  1. 20以内的退位减法 十几减7、6 绿色圃中小学教育网http://www.lspjy.com

  2. 口 算: 11-9= 2 11-8= 3 13-9= 4 16-9= 7 12-8= 4 14-8= 6 15-9= 6 15-8= 7 17-9= 8 16-8= 8 18-9= 9 绿色圃中小学教育网http://www.lspjy.com 问题:同学们算得又对又快,能说说你们是用什么方法算的吗?

  3. 13条金鱼,黑的有7条,红的有 条。 13条金鱼,红的有6条,黑的有 条。

  4. 13-7=6 3 10 3 13条金鱼,黑的有7条,红的有 条。 破十法

  5. 13-7=6 3 4 10 13条金鱼,黑的有7条,红的有 条。 连减法

  6. 13条金鱼,黑的有7条,红的有 条。 想加算减法 7+6=13 13-7=6

  7. 13条金鱼,红的有6条,黑的有 条。 13-6=

  8. 13-6=7 13-6=7 3 3 10 3 10 4 13-6= 7 + 6 =13 13-6=7 绿色圃中小学教育网http://www.lspjy.com 问题:说说你是怎么算的。

  9. 13条金鱼,黑的有7条,红的有 条。 13-7=6 13条金鱼,红的有6条,黑的有 条。 13-6=7 7 + 6 = 13 想加算减法

  10. 1. 算一算。 绿色圃中小学教育网http://www.lspjy.com

  11. 2. 摆摆,说说,算算。 绿色圃中小学教育网http://www.lspjy.com

  12. 3. 问题:(1)从图中你都知道了什么? (2)要求的问题是什么? 绿色圃中小学教育网http://www.lspjy.com (3)你想怎样解答? (4)你是怎么算的?

  13. 4. 每人要跳15个。 绿色圃中小学教育网http://www.lspjy.com 问题:(1)从图中你都知道了什么? (2)你能提出一个问题,并解答吗?

  14. 作业:第14页“做一做”第3题。 第15页练习三,第4题。 绿色圃中小学教育网http://www.lspjy.com

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