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质疑:不严谨处理的利与弊,小学数学教材第三册应用题

  • 2026-04-07 10:03:52
质疑:不严谨处理的利与弊,小学数学教材第三册应用题

专家介绍的小学数学教材编写(摘要):

从数学学科的视角看,小学数学运算的基础几乎没有一处是严格的。更重要的是,所有这些不严格,都是课程标准和教材编写者的刻意而为,都是基于小学数学普及性特征的必然之举。如果置普及性特征于不顾,站在数学严谨性的制高点上设计小学数学的内容体系,那么目前小学数学的概念或方法差不多都存在被诟病的可能。

小编想知道:为什么要这样?这样做到底是有好处还是有害处?不这样描述可以换个方式:这样做到底是利大于弊还是弊大于利?

人教版小学数学第25页“乘加、乘减”的第一个应用题。应用题即涉及名数和计量单位,这里计量单位都是“张”。

“直观画图”图形结合是重要的教学思想,但是数学的最终目的是抽象,因为随着数学的不断发展,纯数字的计算、符号计算等会越来越普遍,会越来越脱离现实的具体情境,因此数学抽象远比直观更重要。

在上例中,两个算式5×4=20(张)、4+5=9(张)并列,学生可能不会明白为什么名数都是“张”,教材的设计和教师经常让学生用不完全归纳法寻找规律,这样的习惯养成当然是好的,但是就在这个例子中,会使学生发现并觉得,不管问什么,也不管是加减乘除,只要问的是“张”,最后的名数就是“张”。

小编的亲身实践和进行了很多调查,孩子们的回答出奇的一致:因为问的是“一共有多少张?”因此名数就是“张”。那为什么不是“排”呢?很多学生就打答出来了。

这也验证了小编的猜测。

其实,它的原理是:4排×5/=20张,这里的计量单位是参与运算的,只有讲明白为什么最后单位也就是“名数”是“张”,才可能真正理解数、量和数量关系。如果连这一点都不明白,最起码的“数感”“量感”核心素养也难以达成。

这种学习是很危险的,是使人糊里糊涂地得出结论,数学的严谨性无从谈起,做题的随意性就此产生。

有人会说:就这样的问题还需要讲吗?这不是明摆着的吗?

小编是不相信的,加法运算符合“同类量累加”,因此既然是同类量,加法可以进行“张+=张”达到量的积累,乘法是加法的逆运算,是不是乘法也表示“同类量的累加?”这就不一定了!

“速度×时间”就不是同量的累加?到时见怎样解释?

教材第35页习题:

14根玉米,每2根装一袋,可以装()袋?

解:14÷2=7(袋)答略。

这实际是一个包含除问题,其本质是问14里面包含几个2。但是(袋)到底是怎么得到的?这就不能用加减和乘的“同类量累加累减”做简单解释了。

最直观的解释是:画图。

抽象呢?14根÷2/=7袋。

这给小学生解释的确难以解释清楚,他们是约分约掉的,除法的/袋”为什么会变成结果的“袋”?

留给专家和一线教师思考怎样给学生讲解清楚!如果放任不讲解清楚,那就糊里糊涂“下金殿”算了!

教材53页例题:

15元买了3个同样的水杯,每个多少钱?

分析:每个水杯多少钱,就是把15元平均分成3份,求,每份是几元,用除法计算。也就是说把15元平均分成3份,每份5元。这里表示的是15-5-5-5元,可以直观感知每份5元,也可以是15元÷3=5/个。

这才是道理和本质。

解:15÷3=5(元)

这好像是什么都能用除法计算,然后带上名数就可以了。

紧接着一个题:一个水杯5元,用15元能买几个水杯?

分析:求能买几个水杯,要知道总钱数和每个的钱数,也就是“求15元里有几个5元”,用除法计算。其本质含义是15里有几个5,或者把15平均分为3份,每份多少用除法。

这是没错的!这里逐渐出现了除法模型。

但这是一个应用题,列式计算课本上很简单:15÷5=3(个)

质疑:为什么15除以3就等于5元,而除以5就等于3个了呢?变魔术吗?

但其实质是:15元÷5/=(个)

“量的增减”到底是怎么回事?

上述“用除法计算”的两个例子,一个用除法得到的名数是(元),另一个除法得到的是却是(个),有几个老师给学生讲清楚了?有几位学生真的明白了?

我不否认好的教师和好的学校的学生专家们能教会他们,但是大部分农村孩子真的就能理解吗?

也许有人说,你这是“没事儿找事儿”,要小编说,这就是基层学生的现状,不解决这样的问题,大多数孩子怎么办?

教育强国首先要打好义务教育的基础,没有好的基础怎么办?为了怕对教材诟病,就不讲科学和严谨,出了问题怪一线教师,这就有点不厚道了。

与《义务教育数学课程标准》修订者的对话2“双基”“四基”和“会思考”的关系

对《义务教育数学课程标准(2022年版)》“核心素养”下的“核心素养的主要表现及其内涵”的质疑与商榷3:逻辑混乱

小学数学教材里那些令人无语的规定

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  1. CONNECT:[ UseTime:0.000580s ] mysql:host=127.0.0.1;port=3306;dbname=c_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000791s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000330s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000293s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000503s ]
  6. SELECT * FROM `set` [ RunTime:0.000194s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000643s ]
  8. SELECT * FROM `article` WHERE `id` = 460056 LIMIT 1 [ RunTime:0.000416s ]
  9. UPDATE `article` SET `lasttime` = 1775612060 WHERE `id` = 460056 [ RunTime:0.003424s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000242s ]
  11. SELECT * FROM `article` WHERE `id` < 460056 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000396s ]
  12. SELECT * FROM `article` WHERE `id` > 460056 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000388s ]
  13. SELECT * FROM `article` WHERE `id` < 460056 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000595s ]
  14. SELECT * FROM `article` WHERE `id` < 460056 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001802s ]
  15. SELECT * FROM `article` WHERE `id` < 460056 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000647s ]
0.082265s