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娜姐有话说~小学计算篇 -pg电子游戏官网官方网站
2011
2020-11-17 21:41
原创
先说一说本文提供的思路适合绝大部分学生课内学习,对于有竞赛需求的娃则需要更上一层楼,以后有机会再聊。
1. 先说小学数学学习的大环境。
目前的状况似乎是小学数学的主要学习阵地已经转移到校外了,尤其是对于家长而言更是如此。拿下学而思、高思、简明等等机构的数学课程,无论家长还是学生都会觉得课内简单到不行!于是,接着课外,接着爽,一直课外,一直爽。当然也有很多家长会质疑:难道紧跟小学课内不可以吗?于是自然就分出两个派系,天天吵个没完,举例说明自己存在的合理性,以及对方的不负责任,甚至还会把老师拉出来评评理。
其实,小学数学学习原则就几个字:反复多次。所以,不报班当然可以,在家自己练习效果也出众。
2. 接着说小学数学内容。
小学数学主要解决的其实就是数的计算问题。你要说还有几何统计概率等问题,也不是不可以,不过这些教材里出现的部分并不是孩子们的难点,以后中学课程也都涵盖,所以充其量只能算是一个内容的下放,并不是核心。至于负数,更是如此,只提概念,相当于啥也没说。
所以小学数学计算基本分为五块:整数四则运算、小数四则运算、分数四则运算、简便运算、简易方程。这几部分内容在小学教材中是割裂的,分布在不同的书本中,而难度经过几次的教材和课标改革,已经删减降低了不少。
即使不删减,也不能适应中学数学的计算强度。所以就会出现一个大问题,紧跟课内不拓展的娃,在进入好的中学后,数学课程跟起来会特别费劲儿。除了抽象度的进一步提升造成的,剩下的就是小学阶段和中学阶段的计算衔接出了问题。直白说:初中阶段默认一个正常小学毕业的娃应该具备的计算能力,实际上仅靠现如今的课内是不太容易实现的,除非你能遇到一个有远见的老师。
3. 小学数学计算需要补充什么才能顺利衔接中学?
其实特别好操作,可以拓展的有两类。第一类是学生对于复杂运算的处理能力需要提升。可以加入多层括号,一个算式中出现六七个数,数的形式不要单一,分数、小数、百分数、整数统统出现。
第二类是学生对于简便运算的处理能力。主要把握住:凑整(加减和乘除都有体现)、分配律、裂项就可以了。其中分配律,不但要会找相同的数,还要会把成倍数的数变化成相同的数,会看破不同形式的数之间的关联。
为什么不练习方程类的计算,初中专门讲啊,小学原理讲不透,所以小学阶段点到为止即可。
4. 怎么才能把计算掌握好?
虽不提倡题海,不过刷过一条河总是应该的。能分类练习最好,可以多准备一些教辅,挑一些自己不行的类型专门练习。另外,关于数的运算主要就靠五、六、七年级的积累,过了就没机会再集中练习计算了,所以再难也得跟着练。
到这,小学数学计算就聊到这儿,爸爸妈妈了解大方向很重要,自家娃自己好把握尺度。中学计算问题以后有时间再聊。
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好文, 最近正琢磨怎么提高娃的计算能力。 茅塞顿开. 谢谢
芝麻和helen 这篇文章太棒了,相见恨晚
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