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1、名师精编优秀教案加减法的估算教学目标：1.了解估算的重要性2.掌握加减法的估算方法教学重点:正确估算加减法教学难点:正确将一个数看作整百、整千的数教学过程：一、切入生活，体验“近似数”1.今天老师带你们到东方商厦家电部去看一看，瞧，有那么多家用电器（电脑出示）电冰箱洗衣机录音机彩电2045元 798元 405元 5898元2.提问：如果我要买一台洗衣机和一台录音机，大约需要多少钱呢？3.想一想：这一题与我们以往学过的应用题有什么不一样呢？4.结论：在问题中有“大约”两字，对，在我们日常生活中，有时只需把一些数看作整百、整千、整万的数，来进行估算，什么是估算呢？估算就是估计一下大约是多少，不需要
2、精确地计算去结果，今天这节课，我们就来学习加减法的估算（出示课题：加减法的估算）二、创设情境，探索方法1.怎么估算呢？先根据题目列出算式：798+405 2.接着将两个加数估计一下接近哪个整百数？798 接近几百？405 接近几百？名师精编优秀教案3.估算 800 加 400 的和是 1200。边讲边板演估算过程798+405 1200 800 400 1200 4.因为估算结果大约是1200 元，所以在算式中不能用等于号，要用一个新的符号。约等号（出示）这个算式怎么读呢？（798加上 405约等于 1200）5.小结：在进行估算时，最重要的是要学会正确估计一个数接近哪个整百、整千、整万的数。
3、三、应用拓展、解决问题1.估计一个数接近哪个整百、整千的数？（请学生说说：你是怎么想的？）285 513 891 907 3002 5943 8034 9980 2.眼力大考验比一比看谁第一个估计出一个数接近哪个整百、整千、整万的数（逐题出示）2002 3990 596 1004 489 9899 3993 4015 684 803 9028 3880 3.写出下列各数接近哪个整百、整千、整万的数。397、1880、5020 4.刚才我们已经学会了估计一个数接近哪个整百、整千的数。下面，我就要请你们帮老师来估算。文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文
4、档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D
5、9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文
6、档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D
7、9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文
8、档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D
9、9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文
10、档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8名师精编优秀教案（回到商店图）（1）如果要买一台彩电，一台冰箱，大约需要多少钱？5898+2045 8000（元）6000 2000（请学生用语言表述计算过程）（2）如果要买一台冰箱、一台洗衣机、大约需要多少钱？2045+798 2800（元）2000 800（3）一台彩电比一台洗衣机大约贵多少元？5898 20454000（元）6000 2000 5.独立练习（书面练习）估算下列各题：2002+3990 596+2003 1001298
11、 5998598 3992703 99853005 四、小结今天我们学习了什么？估算时最重要的是先要能估算出一个数接近哪个整百、整千、整万的数。想一想：估算有什么用处呢？估算还可以帮助我们对计算结果作一个粗略的验算。如：2196+3027=6268（）2000 3000 附 多媒体课件文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U
12、7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9
13、HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U
14、7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9
15、HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U
16、7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9
17、HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8名师精编优秀教案平阳县中心（实验）小学课时锦囊小组提供文档编码:CK6P1
18、S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 Z
19、A9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1
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21、A9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1
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23、A9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8文档编码:CK6P1S4R8A9 HT8D9V1T7J4 ZA9L6K6U7K8