当前位置:首页>小学教材>人教版新一年级下册小学数学教材解读第五单元——100以内的笔算加法、减法

人教版新一年级下册小学数学教材解读第五单元——100以内的笔算加法、减法

  • 2026-04-03 07:53:31
人教版新一年级下册小学数学教材解读第五单元——100以内的笔算加法、减法
      本单元是由上一版教材二年级上册的100以内的加法和减法,这使得口算与笔算加减法的内容整合在一起。在一年级就认识完100以内的数,并掌握一百以内所有的加减法计算本单元的主要变化是删去了连加连减、加减混合的例题,也不在教学两步运算的简便书写方法,对相应的竖式书写方式不再做统一要求。只是在练习中安排了部分题目,让学生迁移已有的知识解决。另外本单元中的问题解决内容调整到了数量关系单元学习。这样的调整使得本单元的内容就聚焦在了笔算加减法、算理和算法的探索上,让学生的学习重点更为突出,也减轻了学生的学习负担。
           下面我们具体来看一下,笔算加减法和口算加减法的算理是相同的,算法是相通的。笔算或者说列竖式计算只是口算过程的一种记录方式。那么为了更好的体现计数单位的必要性,其实可以接续着前面口算的内容,继续安排两位数加减两位数进位退位笔算内容承接前面口算内容的教学基础,是口算内容的一种补充。但是如果直接编排两位数加两位数的进位加法来进行教学,会将新的计算内容的算理探索以及竖式书写方法的教学,特别是数位对齐和进位加法、竖式的书写方法等诸多难点整合在一起。那么对学生而言接受难度较大。
      所以为了同时兼顾到学生的接受程度,教材在笔算加法的例一先安排两位数加两位数不进畏加法的教学。这是学生在口算加减法单元已经学过的内容。通过旧知引入新知,重点就是让学生学习将口算的过程用竖式的形式表示出来的方法。教材在编排上也着重体现了这种由口算向数式过渡的关联性。
先通过小棒和分布算式唤起学生口算的经验,在此基础上再提示学生这个过程可以用竖式来表示,引出用竖式记录口过程的方法。
      教材先呈现了完整的竖式记录形式,以更好的体现竖式和横式的对应关系。这里限于篇幅,教材是分开呈现竖式和横式的。那么在教学中老师们也可以考虑将它们整合在一起排布。更好的体现从用小棒操作的计算过程对应到横式记录的口算过程,再从横式记录的口算过程对应到竖式中的每一项的这样一个对照过程,体会竖式的生成过程。需要注意的是,在例一的学习中仍然只强调十位对齐就可以了,不用强调从个位算起。个位算起的必要性可以在后面结合进位加法的教学来体会。
      例二教学两位数加两位数的进位加法,它的编排方式是与例一一致的,使学生能够充分的迁移利益中的学习经验来进行探索。在使用小棒的直观操作理解算力,通过横式记录口算过程之后,继续使用竖式来表达口算的过程。而在从完整的竖式进行简化时,就会遇到各位相加满十怎样记录的新问题。
      教材在适时的引出进位加法竖式的简便书写方法,同时通过想一想的问题,让学生体会从个位算起。只有当进位加法计算时,如果再从十位开始算起的话,那么十位上因为需要修改,不需要划掉或者擦掉原来的结果重新写,学生才能真正体会到从个位算起的必要性。这一点教材也通过在前一道例题中的想一想的对照来营造了认知冲突,让学生更加深刻的体会这种笔算加法中,从个位算起的必要性。
      此外教材还进一步的加强了知识的迁移和整理。在试一试中让学生探索其他类型的加法竖式的书写方法。这里
主要呈现了两位加两位数进位加法,而且个位相加正好等于10的特殊情况,以及两位数加一位数的进位加法类别,都是前面学习过的内容。这里重点是来帮助学生全面感知各种不同类型的竖式,突破竖式书写的难点,体会列竖式计算。在此基础上教材再引导学生讨论总结笔算加法方法。这也是本套教材第一次出现对计算方法的总结的内容,在后面的学习中,教材也更多的呈现了这种对计算方法的总结,加强了这种知识的及时的总结与整理的内容。
第二小节教学笔算减法,因为有了加法的学习基础,就直接从退位减法来学习,学具上依然通过小棒来提现计数单位的转化过程,但是与进位加法不同,就不再呈现竖式记录的口算过程了,而是直接让学生探索竖式的书写方法,并随着竖式用文字呈现退位减法的计算过程中体会减法从个位算起的必要性。
而退位减法的例二重点突破退位减法的学习难点,也就是被减数的个位是零的退位减法类型,这也是前面两位数减两位数退位减法的特殊情况。在计算道理上没有本质区别,学生可以迁移去解决。教材只是给出了一个思考的提示,试一试同样让学生迁移前面退位减法的竖式书写方法,探索两位数减一位数退位减法和两位数减两位数不退位减法的计算方法。丰富学生对减法竖式类型的认识,并且为学生后续交流总结退位减法的计算方法。

      本单元的整理和复习延续了前面两个单元的编排思路。一方面进一步加强了知识之间的关联,突出竖式是记录口算过程的方式,体现口算和笔算的一致性出来。另一方面在知识图中继续通过加减法的对照,帮助学生体会加减法运算的一致性。并且在前面分别总结笔算加法和笔算减法计算方法的基础上,进一步的整合对整个单元的笔算加减法的计算法则做了一个总结。

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  1. CONNECT:[ UseTime:0.000604s ] mysql:host=127.0.0.1;port=3306;dbname=c_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000833s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000319s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000306s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000693s ]
  6. SELECT * FROM `set` [ RunTime:0.000269s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000739s ]
  8. SELECT * FROM `article` WHERE `id` = 462566 LIMIT 1 [ RunTime:0.002342s ]
  9. UPDATE `article` SET `lasttime` = 1775698202 WHERE `id` = 462566 [ RunTime:0.022451s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000374s ]
  11. SELECT * FROM `article` WHERE `id` < 462566 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000816s ]
  12. SELECT * FROM `article` WHERE `id` > 462566 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000443s ]
  13. SELECT * FROM `article` WHERE `id` < 462566 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002862s ]
  14. SELECT * FROM `article` WHERE `id` < 462566 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.006413s ]
  15. SELECT * FROM `article` WHERE `id` < 462566 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.019901s ]
0.140419s