四年级数学下册第6单元《小数的加法和减法》小数加减混合计算教案2新人教版.doc

上传人:inwarn120 文档编号:1117262 上传时间:2019-04-30 格式:DOC 页数:3 大小:1.03MB
下载 相关 举报
四年级数学下册第6单元《小数的加法和减法》小数加减混合计算教案2新人教版.doc_第1页
第1页 / 共3页
四年级数学下册第6单元《小数的加法和减法》小数加减混合计算教案2新人教版.doc_第2页
第2页 / 共3页
四年级数学下册第6单元《小数的加法和减法》小数加减混合计算教案2新人教版.doc_第3页
第3页 / 共3页
亲,该文档总共3页,全部预览完了,如果喜欢就下载吧!
资源描述

1、16.2 小数加减混合计算教学目标 1、掌握小数加减法混合运算的运算顺序,正确计算小数加减法法混合运算。 2、在教学中进一步培养学生的计算能力. 教学重点:掌握小数加减混合运算顺序。教学难点:能用不同方法解决简单的实际问题,体验算法的多样化。教学设计:1、复习导入1、口算: 0.2+0.3 3.5+2.4 8.7-4.5 1-0.6 0.9-0.5 2.3+5.4 4.9+1 8.6-5.5 0.7+0.8 6.7+1.1 5+6.5 9.7-7回顾小数加减法要注意什么?2、先说运算顺序再计算,可以简便计算吗?156+48+244 1000356444提问:我们已经学习了整数加减混合运算,你认

2、为整数加减混合运算和小数加减混合运算之间有联系吗?有什么样的联系? 二、自主探究1、出示例 3(1)(1)你准备用什么方式进行计算?竖式:7.45+5.8+4.69=17.94 递等式: 7.45+5.8+4.6927.45 =13.25+4.695.8 =17.94+ 4.69 17.94(2)小结:当几个小数进行连加计算时,可以把各个小数写在同一个竖式里,计算简便。也可以按从左往右的顺序进行计算。2、出示例 3(2)(1)你准备用什么方式进行计算?20-6.45-8.3 20-(6.45+8.3)=13.55-8.3 =20-14.75=5.25 =5.253、小结:小数加减混合运算的运算

3、顺序与整数加减混合运算的运算顺序相同,都是从左往右依次计算,如果有小括号的要先算括号里面的。 师:这就是我们这节课要学习的运算。三、巩固练习 w W w .X k b 1.c O m1、P77 做一做 12、你可以提出什么问题?四、课堂总结。通过这节课的学习,你有什么新的收获吗?五、作业练习十八 1、2 题。板书设计 小数加减混合计算37.45+5.8+4.69=17.94 递等式: 7.45+5.8+4.697.45 =13.25+4.695.8 =17.94+ 4.69 17.9420-6.45-8.3 20-(6.45+8.3)=13.55-8.3 =20-14.75=5.25 =5.25

展开阅读全文
相关资源
猜你喜欢
  • DIN 58939-1-2000 Haemostaseology - Reference plasma - Part 1 Requirements preparation《止血学 基准血浆 第1部分 要求和制备》.pdf DIN 58939-1-2000 Haemostaseology - Reference plasma - Part 1 Requirements preparation《止血学 基准血浆 第1部分 要求和制备》.pdf
  • DIN 58940-1-2002 Medical microbiology - Susceptibility testing of pathogens to antimicrobial agents - Part 1 Terminology《医疗微生物学 病原细菌对杀菌剂敏感性的测定方法 第1部分 术语》.pdf DIN 58940-1-2002 Medical microbiology - Susceptibility testing of pathogens to antimicrobial agents - Part 1 Terminology《医疗微生物学 病原细菌对杀菌剂敏感性的测定方法 第1部分 术语》.pdf
  • DIN 58940-10 Bb 1-1998 Medical microbiology - Susceptibility testing of pathogens to antimicrobial agents - Part 10 Criteria for the evaluation of the in vitro efficacy of new anti.pdf DIN 58940-10 Bb 1-1998 Medical microbiology - Susceptibility testing of pathogens to antimicrobial agents - Part 10 Criteria for the evaluation of the in vitro efficacy of new anti.pdf
  • DIN 58940-10-1990 Medical microbiology methods for the determination of susceptibility of pathogens (except mycrobacteria) to antimicrobial agents criteria for the evaluation of th.pdf DIN 58940-10-1990 Medical microbiology methods for the determination of susceptibility of pathogens (except mycrobacteria) to antimicrobial agents criteria for the evaluation of th.pdf
  • DIN 58940-2 Bb 1-1978 Methods for the determination of susceptibility of pathogenic bacteria (without mycobacteria) to chemotherapeutic agents of discs for agar diffusion test exam.pdf DIN 58940-2 Bb 1-1978 Methods for the determination of susceptibility of pathogenic bacteria (without mycobacteria) to chemotherapeutic agents of discs for agar diffusion test exam.pdf
  • DIN 58940-2 Bb 2-2002 Medical microbiology - Susceptibility testing of pathogens to antimicrobial agents - Part 2 Active substance carriers for the agar diffusion test Carrier load.pdf DIN 58940-2 Bb 2-2002 Medical microbiology - Susceptibility testing of pathogens to antimicrobial agents - Part 2 Active substance carriers for the agar diffusion test Carrier load.pdf
  • DIN 58940-2-2007 Medical microbiology - Susceptibility testing of microbial pathogens to antimicrobial agents - Part 2 Active substance carriers for the agar diffusion test Text in.pdf DIN 58940-2-2007 Medical microbiology - Susceptibility testing of microbial pathogens to antimicrobial agents - Part 2 Active substance carriers for the agar diffusion test Text in.pdf
  • DIN 58940-20 Bb 1-2004 Medical microbiology - Susceptibility testing of pathogens to antimicrobial agents - Part 20 Coding of antimicrobial agents - Codes for antimicrobial agents《.pdf DIN 58940-20 Bb 1-2004 Medical microbiology - Susceptibility testing of pathogens to antimicrobial agents - Part 20 Coding of antimicrobial agents - Codes for antimicrobial agents《.pdf
  • DIN 58940-20-2002 Medical microbiology - Susceptibility testing of pathogens to antimicrobial agents - Part 20 Codes for antimicrobial agents《医疗微生物学 病原细菌对杀菌剂敏感性的检测 第20部分 杀菌剂的编码》.pdf DIN 58940-20-2002 Medical microbiology - Susceptibility testing of pathogens to antimicrobial agents - Part 20 Codes for antimicrobial agents《医疗微生物学 病原细菌对杀菌剂敏感性的检测 第20部分 杀菌剂的编码》.pdf
  • 相关搜索

    当前位置:首页 > 考试资料 > 中学考试

    copyright@ 2008-2019 麦多课文库(www.mydoc123.com)网站版权所有
    备案/许可证编号:苏ICP备17064731号-1