一道让我奔溃的儿子的数学题

in cn-stem •  21 days ago

我儿子二年级,昨天他跑过来问我这道题怎么做:

这4个9怎么加减乘除最后等于100

我想了半天,不管怎么加减乘除,甚至于想过指数运算,都不可能得出100的答案。这应该是一道错误的题。

可是儿子很坚持,说这是老师布置的作业,是不可能错的。

这让我很奔溃:一道二年级的数学题,我竟然不会做!!

儿子很看不起我,说这么简单的题目都不会做,我只好偷偷地去问老师。

老师一面安慰我,一边对我说,这个是培养小孩子的观察能力的题目,他们没有像我们大人这样被后来的一些条条框框的规则所影响,班级里面其实有不少小朋友都自己做出来了。

原来,题目并没有规定这里面的4个9是分开的,它们可以任意组合,不需要每个9中间都有运算符。

我这才恍然大悟。

原来我们大人真的是已经形成了固定思维,看到数字中间有空,就直觉地认为里面应该有符号,实际题目可以这样做:

这就变成了9 / 9 + 99 = 100了,当然也可以这样做:

这道题目告诉我们,随着我们年龄的增长,学习知识的增多,我们实际上会被某些思维给圈住,失去了发散性思维的能力,这也属于一种思维僵化。

我们真的应该和小孩子们一起成长,陪伴他们的同时,也能保持我们自己的活力。小孩子的数学题,是让我们这些大人健脑的最好良药。

今后我会给大家分享一些数学方面的知识,陪伴孩子的同时,我们一起来成长吧。



Posted from my blog with SteemPress : https://arch-deletion.000webhostapp.com/2019/01/%e4%b8%80%e9%81%93%e8%ae%a9%e6%88%91%e5%a5%94%e6%ba%83%e7%9a%84%e5%84%bf%e5%ad%90%e7%9a%84%e6%95%b0%e5%ad%a6%e9%a2%98
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