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为什么要写算式说明?

为什么要写算式说明?

这周学的是带余除法进阶,改作业的时候,看到了很多孩子在计算被除数的时候忘记加余数,上课强调过无数前辈在这里流过泪,洒过血,孩子们还是“义无反顾”的掉进陷阱了,但是如果在做题的时候,把被除数怎么算根据题目的条件列出来,这个陷阱大概率就能跳过去了,孩子们可以看看自己的过程,忘记加余数的是不是大部分都没有把被除数怎么算列出来。

今天我们就聊聊做数学题为什么要写一些必要的算式说明~

一、大脑的"内存"到底有多大?

认知科学发现了一个很有意思的事实:我们的大脑在处理信息的时候,能同时“拿住”的东西非常有限。儿童的工作记忆容量有限,小学高年级的孩子大约能同时处理4-5个信息单元,你没看错,4-5个!

什么意思呢?就是孩子在做一道稍微复杂点的题目时,要同时记住:题目里给了什么条件?第一步该干什么?第二步该干什么?中间结果算到哪了?……信息量一多,大脑就开始“卡顿”了。

这就像你打开电脑的十个软件,CPU占满,鼠标开始转圈——不是电脑坏了,是东西太多了。

有研究专门解释过这种现象,叫“工作记忆过载”。孩子审题时跳字漏行、记不住题目中的所有条件、或者忘记某个中间步骤,根源往往不是态度问题,而是大脑的信息量超载了。而数学解题恰恰是需要同时处理最多信息的认知任务之一。

二、“写下来”就是给大脑扩容

那怎么办?总不能换颗更大的脑袋吧?

办法其实就在眼前——写下来

心理学家有一个概念叫“认知卸载”或者“记忆外置”,说白了就是:把你脑子里的信息“存”到纸上,让纸成为你的外挂内存条。

你想想,生活中这样的例子太多了。去超市买东西,你会在脑子里硬记“牛奶、鸡蛋、面包、青菜、酱油吗?大概率你会掏出手机列个清单。为什么?因为怕忘。而写下来之后,你的大脑就不用“记住要买什么”,只需要“看着清单找东西”就行了。

数学题也是一个道理。写算式,就是把那些需要大脑“硬记住”的信息,搬到了纸上。这样一来,大脑就能腾出空间去做真正的思考——而不是当一块人肉内存条。

研究表明,使用外部工具来辅助记忆,能够显著降低认知负荷,从而提升数学解题的表现。而且,当解题者的工作记忆负荷过重时,单纯的“再多想一遍反而会加剧混乱,而把步骤写下来是目前最有效的解决方案之一。

注:小王老师深感最近记忆变差,孩子们找我用积分卡换礼物,总是容易忘记,所以我就编了个消息自己发给自己,上课前再看一下~

三、一道带余除法题,暴露的正是这个问题

回到开头的那个例子。

一道完整的带余除法题,大脑需要同时处理的信息有:除数是几、商是几、余数是几、被除数怎么算(除数×商+余数)——一共4个信息单元,更不用说还需要注意与和倍问题结合考察,这对孩子有限的工作记忆来说,这已经很接近极限了。如果孩子心算能力还不太熟练,或者在算乘法时稍微卡了一下,那么余数这个信息,很可能就在这个过程中被“挤”出去了。

这不是“粗心,这是“内存不够了”。

但如果孩子把被除数怎么求写下来呢?

被除数=商×除数+余数

你看,一到纸上,信息就不用存在脑子里了。大脑只需要专注于“接下来该干什么”就够了。

这也就是为什么我总跟孩子们强调:会做的题,写明白过程;不会做的题,也试着把能写的步骤写出来。别把信息全都压在脑子里。

每次我在课堂上让孩子整理过程,总会有个别同学不写文字说明。我知道,他们觉得写下来浪费时间,觉得自己能记住。

但我想说:把信息写在纸上,不是浪费时间,而是让脑子干活更高效。

因为你空出来的每一寸“内存”,都可以用来做更重要的事——真正去理解题目、去思考解法。而当你的想法有了清晰的路径可循,你离“会做”和“做对”就更近了一步。

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  1. CONNECT:[ UseTime:0.000563s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000769s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000321s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000275s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000477s ]
  6. SELECT * FROM `set` [ RunTime:0.000195s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000507s ]
  8. SELECT * FROM `article` WHERE `id` = 684019 LIMIT 1 [ RunTime:0.000427s ]
  9. UPDATE `article` SET `lasttime` = 1780177001 WHERE `id` = 684019 [ RunTime:0.010005s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000365s ]
  11. SELECT * FROM `article` WHERE `id` < 684019 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000547s ]
  12. SELECT * FROM `article` WHERE `id` > 684019 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000402s ]
  13. SELECT * FROM `article` WHERE `id` < 684019 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000777s ]
  14. SELECT * FROM `article` WHERE `id` < 684019 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001493s ]
  15. SELECT * FROM `article` WHERE `id` < 684019 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001634s ]
0.123410s