三位数减两位数的退位减法

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三位数减两、三位数的退位减法

三位数减两、三位数的退位减法

三位数减两、三位数,要注意: • 1.相同数位对齐。 • 2.从个位算起。 • 3.哪一位上的数不够减, 从前一位“借1当10”再减。 • 4.算完要进行验算。
试一试:
用竖式计算643-580 、764-429,并验算。
643-580= 63
6 4 3 验算: 6 3 + 580 -580 643 63
764-429= 335
7 6 4 验算: 3 3 5 + 429 -429 335 764
算一算: 3 4 7 -2 5 1 9 6 9 7 2 - 8 5 8 8 7
6 7 0 -2 7 3 3 9 7
江苏省电化教育馆制作
练习
1.先找出错在哪里,再改正过来。
3 3 8 -1 9 5 1 4 3
931 -8 9 4 37
526 -2 2 7 2 99
2.大象的身高是多少厘米? 我的身高是 610厘米。 我比长颈鹿矮
370厘米。
610-370=240(厘米)
答:大象的身高是240厘米。
课堂小结 三位数减两、三位数,要注意: (1)相同的数位对齐; (2)从个位减起; (3)哪一位上的数不够减,要从前一位退1
计算减法时,要注意什么?
两数相减, 相同数位对齐,个位不够 减,要向十位退1当十,与个位上的数合起
来,继续减。
图书馆
世界上最美的25座图书馆之一
6
儿童 小说 215本
借出93本, 还剩多少本?
215—93=
百 十 个


你能用竖式计算吗?先算一算,再和同学交流。
· 2 1 5
差的百位是几? 为什么?
第6单元 两、三位数的加法和减法(第6课时)

三位数减法笔算(连续退位减)(教案)-二年级下册数学苏教版

三位数减法笔算(连续退位减)(教案)-二年级下册数学苏教版

三位数减法笔算(连续退位减)(教案)二年级下册数学苏教版我今天要为大家教授的是二年级下册数学苏教版中的一个重要知识点——三位数减法笔算(连续退位减)。

一、教学内容我们今天的学习内容是三位数减去一个两位数,这种情况可能会出现退位,所以我们需要掌握连续退位的笔算法则。

具体的教学内容为教材的第三章第二节,内容详细介绍了三位数减法笔算的步骤和连续退位的处理方法。

二、教学目标通过今天的学习,我希望同学们能够熟练掌握三位数减法笔算的步骤,尤其是连续退位的处理方法,能够独立完成相关的习题。

三、教学难点与重点今天的教学难点和重点都是连续退位的处理方法。

因为这种情况在笔算中比较复杂,需要同学们反复练习才能熟练掌握。

四、教具与学具准备为了帮助同学们更好地理解和学习,我已经准备好了黑板、粉笔、练习本和相关的习题。

五、教学过程六、板书设计我会设计一个简洁明了的板书,清晰地展示笔算的步骤和连续退位的处理方法,以便同学们能够直观地理解和记忆。

七、作业设计今天的作业我会设计一些相关的习题,让同学们能够通过实践来巩固所学的内容。

具体的作业题目如下:1. 235 87 = ?2. 456 32 = ?3. 789 56 = ?八、课后反思及拓展延伸通过今天的教学,我会及时反思自己的教学方法和效果,根据同学们的学习情况,适时调整教学策略。

同时,我也会鼓励同学们在课后进行拓展延伸,通过更多的习题来提高自己的笔算能力。

这就是我今天要为大家教授的内容,希望通过我的讲解和同学们的认真学习,大家能够掌握三位数减法笔算(连续退位减)的方法。

让我们一起加油吧!重点和难点解析在今天的教学过程中,我发现有几个重点和难点是需要同学们特别关注的。

我要强调的是连续退位的处理方法。

在三位数减去一个两位数的时候,有可能会出现退位的情况。

这种情况对于同学们来说是一个比较复杂的问题,因此我会在课堂上详细讲解连续退位的处理方法,并安排足够的练习时间,让同学们能够熟练掌握。

《三位数减两位数、三位数退位减法》教案2023-2024学年数学二年级下册-人教版

《三位数减两位数、三位数退位减法》教案2023-2024学年数学二年级下册-人教版

《三位数减两位数、三位数退位减法》教案20232024学年数学二年级下册人教版一、教学内容我们使用的教材是人教版二年级下册的数学课本,今天我们将学习第54页至56页的内容,主要包括三位数减两位数的笔算方法和三位数退位减法的计算步骤。

二、教学目标通过本节课的学习,我希望学生们能够掌握三位数减两位数的计算方法,理解退位减法的原理,并能熟练地进行笔算。

三、教学难点与重点本节课的重点是三位数减两位数的笔算方法,以及退位减法的计算步骤。

难点则是理解退位减法中的“借位”概念。

四、教具与学具准备为了帮助学生们更好地理解课程内容,我已经准备好了黑板、粉笔、多媒体教学设备,以及一份份含有不同例题的练习纸。

五、教学过程1. 实践情景引入:我会以一个实际情境为例,比如“小华买了358本书,送给小明129本,他还剩下多少本?”来引起学生们的兴趣。

2. 例题讲解:接着,我会用黑板和粉笔详细地展示三位数减两位数的笔算方法,以358减去129为例,讲解每一步的计算过程。

3. 随堂练习:在讲解完例题后,我会分发含有不同题目的练习纸,让学生们当场进行练习,并及时给予他们反馈。

5. 练习巩固:我会给出几道退位减法的题目,让学生们独立完成,以巩固他们刚刚学到的知识。

六、板书设计我在黑板上会写出今天课程的两个主要公式,分别是:1. 三位数减两位数笔算方法:被减数减数358 1292. 退位减法计算步骤:被减数减数358 12910七、作业设计作业题目:1. 小华买了487个糖果,送给小明189个,他还剩下多少个?2. 小华买了573个玩具,送给小明268个,他还剩下多少个?作业答案:1. 487 189 = 2982. 573 268 = 305八、课后反思及拓展延伸课后,我会反思今天课堂上的教学效果,观察学生们对三位数减两位数和退位减法的掌握情况。

对于理解有困难的学生,我会个别辅导,帮助他们更好地理解退位减法的原理。

同时,我也会鼓励学生们在日常生活中,运用所学的减法知识,解决实际问题。

三位数减两位数的退位减法

三位数减两位数的退位减法

时间差计算问题
在计算两个时间点之间的时间差时,可能需要用到退位减法。例如,计算从早上 8点到下午3点经过了多少小时,即3-8=-5小时,因为-5是负数,所以需要从24 小时制中借1位,变成3+12-8=7小时。
在一些需要精确到分钟的时间差计算中,也可能涉及到退位减法。例如,计算从 上午9:35到下午1:10经过了多少分钟,即(1:10-9:35)=-505分钟,因为-505 是负数,所以需要从24小时制中借1位变成(1:10+12:00-9:35)=3小时35分钟 ,即215分钟。
粗心大意
学生在计算过程中粗心大 意,没有认真审题和检查 计算过程。
缺乏练习
学生缺乏足够的练习,对 退位减法的计算不够熟练 。
针对性纠正措施
01
02
03
04
强化原理讲解
教师可以通过举例、演示等方 式,帮助学生深入理解退位减 法的原理,掌握计算规则。
加强审题训练
教师可以引导学生认真审题, 明确题目要求,避免因为粗心 大意而导致的错误。
02
三位数减两位数方法技巧
逐位相减法则
80%
对应数位对齐
在减法运算中,首先要确保三位 数和两位数的数位对齐,即个位 对个位,十位对十位,百位对百 位。
100%
从个位开始减
从个位开始逐位相减,如果个位 不够减,则向十位借位。
80%
逐位相减至高位
依次进行十位和百位的减法运算 ,注意借位处理。
借位处理技巧
计算步骤详解
01
02
03
04
步骤1
对齐数位,将三位数和两位数 的个位、十位、百位分别对齐

步骤2
从个位开始减,如果个位不够 减,向十位借1。

三位数减两位数退位减法10套带规范标准答案

三位数减两位数退位减法10套带规范标准答案

三位数减两位数退位减法练习(一)用时:______分_______秒281 - 18 = 744 - 37 = 184 - 87 = 148 - 29 = 345 - 37 = 614 - 86 = 806 - 78 = 443 - 35 = 554 - 67 = 693 - 56 = 577 - 38 = 645 - 57 = 172 - 28 = 721 - 24 = 767 - 29 = 407 - 39 = 434 - 95 = 735 - 59 = 826 - 39 = 430 - 58 = 297 - 59 = 613 - 48 = 292 - 27 = 645 - 78 = 954 - 66 = 213 - 46 = 527 - 79 = 217 - 78 = 297 - 68 = 492 - 67 = 710 - 32 = 818 - 89 = 494 - 35 = 767 - 89 = 646 - 59 = 205 - 48 = 753 - 45 = 415 - 68 = 815 - 67 = 181 - 25 =351 - 28 = 863 - 56 = 884 - 37 = 164 - 66 = 145 - 29 = 613 - 67 = 840 - 63 = 313 - 89 = 237 - 99 = 630 - 58 = 850 - 44 = 568 - 59 = 545 - 17 = 161 - 33 = 651 - 25 = 753 - 75 = 468 - 59 = 281 - 59 = 665 - 88 = 223 - 49 = 676 - 99 = 885 - 48 = 641 - 73 = 214 - 75 = 560 - 24 = 407 - 49 = 688 - 29 = 411 - 85 = 621 - 66 = 917 - 68 = 764 - 87 = 465 - 98 = 618 - 39 = 454 - 36 = 633 - 44 = 254 - 85 = 662 - 45 = 682 - 56 = 327 - 58 = 764 - 59 =三位数减两位数退位减法练习(二)用时:______分_______秒586 - 39 = 242 - 17 = 957 - 78 = 326 - 47 = 753 - 48 = 998 - 59 = 328 - 19 = 856 - 68 = 120 - 45 = 565 - 87 = 671 - 77 = 524 - 39 = 433 - 98 = 964 - 97 = 732 - 38 = 243 - 26 = 356 - 48 = 121 - 25 = 882 - 28 = 884 - 68 = 474 - 17 = 737 - 38 = 316 - 37 = 211 - 85 = 377 - 39 = 286 - 18 = 932 - 38 = 365 - 86 = 811 - 62 = 261 - 37 = 240 - 64 = 531 - 75 = 471 - 17 = 392 - 44 = 263 - 38 = 463 - 68 = 898 - 99 = 208 - 59 = 411 - 95 = 815 - 38 =297 - 28 = 482 - 87 = 892 - 26 = 556 - 39 =333 - 87 = 386 - 58 = 436 - 48 = 515 - 67 = 203 - 76 = 636 - 37 = 428 - 29 = 167 - 78 = 410 - 64 = 873 - 35 = 855 - 59 = 521 - 27 = 934 - 28 = 574 - 86 = 184 - 66 = 732 - 14 = 237 - 49 = 765 - 68 = 417 - 78 = 773 - 34 = 752 - 79 = 995 - 19 = 912 - 15 = 531 - 24 = 556 - 29 = 436 - 29 = 247 - 89 = 494 - 17 = 803 - 55 = 667 - 38 = 586 - 28 = 453 - 77 =280 - 73 = 117 - 49 = 480 - 89 = 494 - 68 = 三位数减两位数退位减法练习(三)用时:______分_______秒530 - 56 = 516 - 68 = 413 - 67 = 872 - 39 = 382 - 23 = 724 - 78 = 704 - 98 = 881 - 42 = 764 - 59 = 775 - 28 = 806 - 38 = 454 - 25 = 422 - 25 = 477 - 58 = 775 - 67 = 408 - 59 = 838 - 79 = 814 - 19 = 724 - 98 = 413 - 38 = 362 - 86 = 687 - 29 = 875 - 49 = 511 - 88 = 796 - 38 = 361 - 64 = 973 - 86 = 521 - 54 = 765 - 77 = 826 - 49 = 693 - 66 = 140 - 48 = 712 - 46 = 351 - 46 = 631 - 87 = 260 - 27 = 665 - 46 = 305 - 66 = 320 - 55 = 737 - 39 = 550 - 67 = 876 - 79 = 611 - 25 = 524 - 77 =347 - 38 = 383 - 58 = 881 - 83 = 236 - 29 =528 - 89 = 386 - 18 = 624 - 47 = 483 - 14 = 941 - 45 = 342 - 84 = 140 - 28 = 662 - 14 = 515 - 86 = 864 - 97 = 881 - 29 = 934 - 45 = 195 - 76 = 922 - 36 = 177 - 28 = 612 - 87 = 783 - 48 = 858 - 89 = 633 - 65 = 116 - 29 = 123 - 57 = 381 - 16 = 724 - 79 = 246 - 77 = 841 - 44 = 741 - 35 = 776 - 17 = 954 - 76 =685 - 38 = 642 - 37 = 442 - 28 = 331 - 84 = 三位数减两位数退位减法练习(四)用时:______分_______秒872 - 73 = 685 - 78 = 812 - 68 = 333 - 86 =613 - 37 = 723 - 65 = 743 - 28 = 826 - 79 = 837 - 28 = 685 - 78 = 317 - 69 = 451 - 83 = 645 - 68 = 416 - 58 = 516 - 27 = 858 - 69 = 203 - 86 = 918 - 79 = 925 - 57 = 673 - 88 = 407 - 69 = 457 - 69 = 571 - 94 = 827 - 79 = 354 - 97 = 522 - 97 = 596 - 68 = 120 - 14 = 317 - 59 = 826 - 48 = 882 - 78 = 737 - 48 = 392 - 56 = 313 - 75 = 704 - 67 = 223 - 87 = 653 - 85 = 361 - 62 = 116 - 69 = 501 - 87 = 984 - 29 = 773 - 65 = 245 - 68 = 228 - 59 = 511 - 49 = 317 - 49 = 693 - 99 = 861 - 16 =803 - 87 = 216 - 78 = 604 - 76 = 436 - 69 = 322 - 18 = 278 - 29 = 984 - 16 = 346 - 59 = 281 - 83 = 723 - 75 = 410 - 86 = 784 - 36 = 823 - 58 = 377 - 48 = 474 - 57 = 436 - 48 = 245 - 37 = 903 - 67 = 812 - 98 = 761 - 53 = 411 - 63 = 884 - 48 = 644 - 58 = 545 - 27 = 604 - 66 = 530 - 33 = 932 - 38 = 237 - 38 = 884 - 47 = 363 - 54 = 343 - 58 = 205 - 68 =三位数减两位数退位减法练习(五)用时:______分_______秒981 - 13 = 225 - 49 = 668 - 19 = 243 - 37 =916 - 18 = 283 - 45 = 573 - 46 = 497 - 69 = 832 - 85 = 604 - 45 = 844 - 36 = 115 - 99 = 234 - 88 = 192 - 54 = 454 - 56 = 292 - 36 = 465 - 16 = 237 - 28 = 648 - 39 = 354 - 87 = 236 - 39 = 111 - 92 = 317 - 99 = 941 - 55 = 931 - 68 = 513 - 65 = 154 - 68 = 526 - 47 = 710 - 62 = 596 - 48 = 325 - 18 = 414 - 26 = 356 - 59 = 260 - 98 = 730 - 45 = 861 - 36 = 872 - 63 = 516 - 49 = 886 - 77 = 363 - 39 = 852 - 43 = 885 - 38 = 710 - 84 = 577 - 78 = 415 - 47 = 334 - 96 = 664 - 39 = 981 - 23 =721 - 94 = 518 - 99 = 556 - 27 = 352 - 15 =612 - 58 = 538 - 89 = 363 - 99 = 471 - 88 = 875 - 29 = 477 - 89 = 526 - 39 = 525 - 38 = 343 - 57 = 486 - 38 = 413 - 88 = 787 - 98 = 527 - 68 = 788 - 89 = 150 - 43 = 596 - 78 = 758 - 49 = 310 - 63 = 881 - 36 = 857 - 29 = 838 - 89 = 365 - 78 = 857 - 79 = 858 - 69 =828 - 39 = 483 - 86 = 801 - 72 = 914 - 78 = 三位数减两位数退位减法练习(六)用时:______分_______秒256 - 28 = 973 - 25 = 372 - 89 = 835 - 28 = 456 - 67 = 337 - 38 = 696 - 88 = 164 - 69 =911 - 26 = 407 - 69 = 434 - 77 = 331 - 13 = 607 - 38 = 671 - 58 = 557 - 79 = 453 - 36 = 796 - 78 = 270 - 81 = 521 - 37 = 832 - 85 = 814 - 68 = 404 - 68 = 806 - 57 = 826 - 49 = 275 - 47 = 676 - 68 = 281 - 59 = 863 - 67 = 198 - 59 = 352 - 77 = 342 - 28 = 814 - 29 = 211 - 84 = 784 - 17 = 125 - 37 = 486 - 58 = 955 - 29 = 246 - 59 = 494 - 69 = 664 - 17 = 480 - 84 = 677 - 28 = 422 - 74 = 761 - 27 = 485 - 77 = 753 - 36 = 442 - 25 = 741 - 66 = 864 - 57 = 637 - 58 = 536 - 48 = 964 - 37 =233 - 74 = 542 - 73 = 355 - 18 = 113 - 59 = 536 - 68 = 712 - 26 = 531 - 43 = 281 - 72 = 685 - 28 = 477 - 38 = 106 - 69 = 562 - 96 = 213 - 35 = 460 - 38 = 527 - 49 = 480 - 99 = 567 - 29 = 594 - 36 = 723 - 85 = 465 - 86 = 633 - 15 = 544 - 17 = 195 - 57 = 323 - 78 = 336 - 78 = 343 - 77 = 454 - 66 = 574 - 26 =三位数减两位数退位减法练习(七)用时:______分_______秒774 - 66 = 394 - 55 = 855 - 28 = 641 - 89 = 284 - 58 = 742 - 45 = 158 - 59 = 556 - 99 = 430 - 69 = 623 - 57 = 453 - 25 = 548 - 29 =713 - 76 = 383 - 37 = 223 - 54 = 286 - 69 = 103 - 48 = 961 - 68 = 903 - 38 = 847 - 69 = 366 - 49 = 125 - 38 = 550 - 98 = 212 - 34 = 255 - 28 = 775 - 68 = 386 - 48 = 103 - 44 = 903 - 47 = 141 - 37 = 601 - 83 = 830 - 22 = 211 - 36 = 345 - 46 = 266 - 59 = 331 - 39 = 872 - 29 = 277 - 29 = 443 - 86 = 721 - 82 = 923 - 95 = 724 - 76 = 551 - 46 = 767 - 79 = 704 - 27 = 323 - 56 = 852 - 53 = 131 - 95 = 325 - 87 = 264 - 98 = 655 - 37 = 242 - 27 = 472 - 56 = 260 - 66 = 252 - 84 = 872 - 34 =876 - 67 = 216 - 58 = 272 - 25 = 456 - 48 = 527 - 89 = 403 - 26 = 753 - 75 = 380 - 77 = 464 - 15 = 961 - 28 = 770 - 47 = 844 - 55 = 433 - 94 = 237 - 69 = 311 - 56 = 255 - 28 = 443 - 26 = 364 - 68 = 656 - 98 = 281 - 88 = 875 - 68 = 345 - 88 = 374 - 48 = 242 - 67 =三位数减两位数退位减法练习(八)用时:______分_______秒428 - 49 = 410 - 86 = 784 - 27 = 468 - 29 = 372 - 33 = 723 - 94 = 916 - 68 = 220 - 59 = 774 - 26 = 227 - 38 = 875 - 99 = 551 - 73 =205 - 48 = 812 - 37 = 297 - 59 = 407 - 38 = 220 - 43 = 314 - 58 = 746 - 88 = 248 - 89 = 277 - 18 = 602 - 68 = 656 - 98 = 747 - 58 = 637 - 78 = 454 - 45 = 744 - 67 = 491 - 48 = 543 - 68 = 864 - 57 = 268 - 59 = 714 - 68 = 784 - 79 = 180 - 77 = 161 - 68 = 483 - 86 = 717 - 88 = 440 - 45 = 732 - 88 = 175 - 58 = 372 - 43 = 287 - 39 = 303 - 29 = 838 - 79 = 167 - 38 = 787 - 28 = 717 - 39 = 614 - 36 = 482 - 96 = 274 - 68 = 824 - 68 = 377 - 48 = 736 - 68 = 435 - 27 = 846 - 39 = 721 - 59 =416 - 78 = 627 - 69 = 964 - 48 = 820 - 56 =618 - 79 = 187 - 78 = 483 - 46 = 837 - 78 = 466 - 38 = 551 - 83 = 211 - 45 = 770 - 43 = 762 - 39 = 505 - 87 = 538 - 49 = 761 - 86 = 753 - 14 = 568 - 79 = 721 - 12 = 610 - 95 =422 - 16 = 425 - 66 = 123 - 26 = 862 - 96 = 三位数减两位数退位减法练习(九)用时:______分_______秒261 - 54 = 184 - 86 = 348 - 49 = 556 - 59 = 481 - 92 = 447 - 39 = 750 - 38 = 243 - 46 = 946 - 68 = 655 - 67 = 164 - 95 = 567 - 49 = 633 - 86 = 952 - 34 = 835 - 27 = 632 - 19 =543 - 95 = 305 - 57 = 718 - 59 = 407 - 49 = 241 - 13 = 337 - 79 = 323 - 88 = 871 - 88 = 214 - 95 = 576 - 87 = 548 - 59 = 674 - 78 = 314 - 38 = 767 - 99 = 981 - 34 = 243 - 36 = 260 - 25 = 841 - 39 = 274 - 26 = 765 - 99 = 463 - 78 = 316 - 47 = 886 - 28 = 161 - 79 = 311 - 87 = 211 - 84 = 486 - 58 = 612 - 77 = 275 - 67 = 872 - 85 = 115 - 88 = 906 - 78 = 442 - 34 = 884 - 27 = 360 - 65 = 294 - 47 = 832 - 95 = 727 - 39 = 884 - 38 = 465 - 88 = 717 - 28 = 211 - 33 = 240 - 52 = 187 - 88 =574 - 29 = 911 - 67 = 710 - 85 = 252 - 84 = 152 - 56 = 148 - 39 = 604 - 89 = 876 - 89 = 214 - 46 = 756 - 57 = 750 - 59 = 277 - 88 = 726 - 48 = 295 - 38 = 898 - 49 = 217 - 88 =三位数减两位数退位减法练习(十)用时:______分_______秒176 - 78 = 310 - 27 = 494 - 88 = 832 - 87 = 683 - 67 = 715 - 68 = 771 - 63 = 137 - 78 = 114 - 28 = 821 - 95 = 232 - 25 = 615 - 98 = 815 - 76 = 632 - 85 = 950 - 29 = 953 - 89 =222 - 54 = 360 - 45 = 642 - 66 = 764 - 75 = 334 - 17 = 768 - 59 = 536 - 57 = 181 - 96 = 330 - 65 = 743 - 97 = 488 - 89 = 875 - 77 = 448 - 79 = 117 - 89 = 671 - 79 = 815 - 48 = 234 - 99 = 630 - 43 = 222 - 73 = 287 - 79 = 411 - 27 = 585 - 58 = 762 - 96 = 945 - 58 = 114 - 98 = 803 - 66 = 284 - 87 = 402 - 46 = 354 - 57 = 642 - 57 = 236 - 18 = 447 - 89 = 940 - 67 = 430 - 32 = 796 - 78 = 900 - 97 = 885 - 38 = 276 - 29 = 562 - 65 = 631 - 42 =325 - 28 = 871 - 73 = 465 - 36 = 257 - 78 =454 - 35 = 977 - 89 = 671 - 32 = 361 - 62 = 626 - 48 = 778 - 79 = 366 - 39 = 944 - 76 = 456 - 88 = 460 - 47 = 648 - 79 = 572 - 18 =234 - 99 = 341 - 78 = 380 - 36 = 245 - 28 = ------------------------练习(一)答案------------------------------------281 - 18 =263 744 - 37 =707 184 - 87 =97 148 - 29 =119345 - 37 =308 614 - 86 =528 806 - 78 =728 443 - 35 =408554 - 67 =487 693 - 56 =637 577 - 38 =539 645 - 57 =588172 - 28 =144 721 - 24 =697 767 - 29 =738 407 - 39 =368434 - 95 =339 735 - 59 =676 826 - 39 =787 430 - 58 =372297 - 59 =238 613 - 48 =565 292 - 27 =265 645 - 78 =567954 - 66 =888 213 - 46 =167 527 - 79 =448 217 - 78 =139297 - 68 =229 492 - 67 =425 710 - 32 =678 818 - 89 =729494 - 35 =459 767 - 89 =678 646 - 59 =587 205 - 48 =157753 - 45 =708 415 - 68 =347 815 - 67 =748 181 - 25 =156351 - 28 =323 863 - 56 =807 884 - 37 =847 164 - 66 =98145 - 29 =116 613 - 67 =546 840 - 63 =777 313 - 89 =224237 - 99 =138 630 - 58 =572 850 - 44 =806 568 - 59 =509545 - 17 =528 161 - 33 =128 651 - 25 =626 753 - 75 =678468 - 59 =409 281 - 59 =222 665 - 88 =577 223 - 49 =174676 - 99 =577 885 - 48 =837 641 - 73 =568 214 - 75 =139560 - 24 =536 407 - 49 =358 688 - 29 =659 411 - 85 =326621 - 66 =555 917 - 68 =849 764 - 87 =677 465 - 98 =367618 - 39 =579 454 - 36 =418 633 - 44 =589 254 - 85 =169662 - 45 =617 682 - 56 =626 327 - 58 =269 764 - 59 =705--------------------------练习(二)答案---------------------------------586 - 39 =547 242 - 17 =225 957 - 78 =879 326 - 47 =279753 - 48 =705 998 - 59 =939 328 - 19 =309 856 - 68 =788120 - 45 =75 565 - 87 =478 671 - 77 =594 524 - 39 =485433 - 98 =335 964 - 97 =867 732 - 38 =694 243 - 26 =217356 - 48 =308 121 - 25 =96 882 - 28 =854 884 - 68 =816474 - 17 =457 737 - 38 =699 316 - 37 =279 211 - 85 =126377 - 39 =338 286 - 18 =268 932 - 38 =894 365 - 86 =279811 - 62 =749 261 - 37 =224 240 - 64 =176 531 - 75 =456471 - 17 =454 392 - 44 =348 263 - 38 =225 463 - 68 =395898 - 99 =799 208 - 59 =149 411 - 95 =316 815 - 38 =777297 - 28 =269 482 - 87 =395 892 - 26 =866 556 - 39 =517333 - 87 =246 386 - 58 =328 436 - 48 =388 515 - 67 =448203 - 76 =127 636 - 37 =599 428 - 29 =399 167 - 78 =89410 - 64 =346 873 - 35 =838 855 - 59 =796 521 - 27=494934 - 28 =906 574 - 86 =488 184 - 66 =118 732 - 14 =718237 - 49 =188 765 - 68 =697 417 - 78 =339 773 - 34 =739752 - 79 =673 995 - 19 =976 912 - 15 =897 531 - 24 =507556 - 29 =527 436 - 29 =407 247 - 89 =158 494 - 17 =477803 - 55 =748 667 - 38 =629 586 - 28 =558 453 - 77 =376280 - 73 =207 117 - 49 =68 480 - 89 =391 494 - 68 =426 -----------------------------练习(三)答案-----------------------------530 - 56 =474 516 - 68 =448 413 - 67 =346 872 - 39 =833382 - 23 =359 724 - 78 =646 704 - 98 =606 881 - 42 =839764 - 59 =705 775 - 28 =747 806 - 38 =768 454 - 25 =429422 - 25 =397 477 - 58 =419 775 - 67 =708 408 - 59 =349838 - 79 =759 814 - 19 =795 724 - 98 =626 413 - 38 =375362 - 86 =276 687 - 29 =658 875 - 49 =826 511 - 88 =423796 - 38 =758 361 - 64 =297 973 - 86 =887 521 - 54 =467765 - 77 =688 826 - 49 =777 693 - 66 =627 140 - 48 =92712 - 46 =666 351 - 46 =305 631 - 87 =544 260 - 27 =233665 - 46 =619 305 - 66 =239 320 - 55 =265 737 - 39 =698550 - 67 =483 876 - 79 =797 611 - 25 =586 524 - 77 =447347 - 38 =309 383 - 58 =325 881 - 83 =798 236 - 29 =207528 - 89 =439 386 - 18 =368 624 - 47 =577 483 - 14 =469941 - 45 =896 342 - 84 =258 140 - 28 =112 662 - 14 =648515 - 86 =429 864 - 97 =767 881 - 29 =852 934 - 45 =889195 - 76 =119 922 - 36 =886 177 - 28 =149 612 - 87 =525783 - 48 =735 858 - 89 =769 633 - 65 =568 116 - 29 =87123 - 57 =66 381 - 16 =365 724 - 79 =645 246 - 77 =169841 - 44 =797 741 - 35 =706 776 - 17 =759 954 - 76 =878685 - 38 =647 642 - 37 =605 442 - 28 =414 331 - 84 =247---------------------------练习(四)答案---------------------------------872 - 73 =799 685 - 78 =607 812 - 68 =744 333 - 86 =247613 - 37 =576 723 - 65 =658 743 - 28 =715 826 - 79 =747837 - 28 =809 685 - 78 =607 317 - 69 =248 451 - 83 =368645 - 68 =577 416 - 58 =358 516 - 27 =489 858 - 69 =789203 - 86 =117 918 - 79 =839 925 - 57 =868 673 - 88 =585407 - 69 =338 457 - 69 =388 571 - 94 =477 827 - 79 =748354 - 97 =257 522 - 97 =425 596 - 68 =528 120 - 14 =106317 - 59 =258 826 - 48 =778 882 - 78 =804 737 - 48 =689392 - 56 =336 313 - 75 =238 704 - 67 =637 223 - 87 =136653 - 85 =568 361 - 62 =299 116 - 69 =47 501 - 87 =414984 - 29 =955 773 - 65 =708 245 - 68 =177 228 - 59 =169511 - 49 =462 317 - 49 =268 693 - 99 =594 861 - 16 =845803 - 87 =716 216 - 78 =138 604 - 76 =528 436 - 69 =367322 - 18 =304 278 - 29 =249 984 - 16 =968 346 - 59 =287281 - 83 =198 723 - 75 =648 410 - 86 =324 784 - 36 =748823 - 58 =765 377 - 48 =329 474 - 57 =417 436 - 48 =388245 - 37 =208 903 - 67 =836 812 - 98 =714 761 - 53 =708411 - 63 =348 884 - 48 =836 644 - 58 =586 545 - 27 =518604 - 66 =538 530 - 33 =497 932 - 38 =894 237 - 38 =199884 - 47 =837 363 - 54 =309 343 - 58 =285 205 - 68 =137--------------------------练习(五)答案-------------------------------981 - 13 =968 225 - 49 =176 668 - 19 =649 243 - 37 =206916 - 18 =898 283 - 45 =238 573 - 46 =527 497 - 69 =428832 - 85 =747 604 - 45 =559 844 - 36 =808 115 - 99 =16 234 - 88 =146 192 - 54 =138 454 - 56 =398 292 - 36465 - 16 =449 237 - 28 =209 648 - 39 =609 354 - 87 =267236 - 39 =197 111 - 92 =19 317 - 99 =218 941 - 55 =886931 - 68 =863 513 - 65 =448 154 - 68 =86 526 - 47 =479710 - 62 =648 596 - 48 =548 325 - 18 =307 414 - 26 =388356 - 59 =297 260 - 98 =162 730 - 45 =685 861 - 36 =825872 - 63 =809 516 - 49 =467 886 - 77 =809 363 - 39 =324852 - 43 =809 885 - 38 =847 710 - 84 =626 577 - 78 =499415 - 47 =368 334 - 96 =238 664 - 39 =625 981 - 23721 - 94 =627 518 - 99 =419 556 - 27 =529 352 - 15 =337612 - 58 =554 538 - 89 =449 363 - 99 =264 471 - 88 =383875 - 29 =846 477 - 89 =388 526 - 39 =487 525 - 38 =487343 - 57 =286 486 - 38 =448 413 - 88 =325 787 - 98 =689527 - 68 =459 788 - 89 =699 150 - 43 =107 596 - 78 =518758 - 49 =709 310 - 63 =247 881 - 36 =845 857 - 29 =828838 - 89 =749 365 - 78 =287 857 - 79 =778 858 - 69 =789828 - 39 =789 483 - 86 =397 801 - 72 =729 914 - 78 =836--------------------------练习(六)答案---------------------------------256 - 28 =228 973 - 25 =948 372 - 89 =283 835 - 28 =807456 - 67 =389 337 - 38 =299 696 - 88 =608 164 - 69 =95911 - 26 =885 407 - 69 =338 434 - 77 =357 331 - 13 =318607 - 38 =569 671 - 58 =613 557 - 79 =478 453 - 36 =417796 - 78 =718 270 - 81 =189 521 - 37 =484 832 - 85 =747814 - 68 =746 404 - 68 =336 806 - 57 =749 826 - 49=777275 - 47 =228 676 - 68 =608 281 - 59 =222 863 - 67 =796198 - 59 =139 352 - 77 =275 342 - 28 =314 814 - 29 =785211 - 84 =127 784 - 17 =767 125 - 37 =88 486 - 58 =428955 - 29 =926 246 - 59 =187 494 - 69 =425 664 - 17 =647480 - 84 =396 677 - 28 =649 422 - 74 =348 761 - 27 =734485 - 77 =408 753 - 36 =717 442 - 25 =417 741 - 66 =675864 - 57 =807 637 - 58 =579 536 - 48 =488 964 - 37 =927233 - 74 =159 542 - 73 =469 355 - 18 =337 113 - 59 =54536 - 68 =468 712 - 26 =686 531 - 43 =488 281 - 72 =209685 - 28 =657 477 - 38 =439 106 - 69 =37 562 - 96 =466213 - 35 =178 460 - 38 =422 527 - 49 =478 480 - 99 =381567 - 29 =538 594 - 36 =558 723 - 85 =638 465 - 86 =379633 - 15 =618 544 - 17 =527 195 - 57 =138 323 - 78 =245336 - 78 =258 343 - 77 =266 454 - 66 =388 574 - 26 =548--------------------------练习(七)答案----------------------------------774 - 66 =708 394 - 55 =339 855 - 28 =827 641 - 89 =552284 - 58 =226 742 - 45 =697 158 - 59 =99 556 - 99 =457430 - 69 =361 623 - 57 =566 453 - 25 =428 548 - 29 =519713 - 76 =637 383 - 37 =346 223 - 54 =169 286 - 69 =217103 - 48 =55 961 - 68 =893 903 - 38 =865 847 - 69 =778366 - 49 =317 125 - 38 =87 550 - 98 =452 212 - 34 =178255 - 28 =227 775 - 68 =707 386 - 48 =338 103 - 44 =59903 - 47 =856 141 - 37 =104 601 - 83 =518 830 - 22 =808211 - 36 =175 345 - 46 =299 266 - 59 =207 331 - 39 =292872 - 29 =843 277 - 29 =248 443 - 86 =357 721 - 82 =639923 - 95 =828 724 - 76 =648 551 - 46 =505 767 - 79 =688704 - 27 =677 323 - 56 =267 852 - 53 =799 131 - 95 =36325 - 87 =238 264 - 98 =166 655 - 37 =618 242 - 27 =215472 - 56 =416 260 - 66 =194 252 - 84 =168 872 - 34 =838876 - 67 =809 216 - 58 =158 272 - 25 =247 456 - 48 =408527 - 89 =438 403 - 26 =377 753 - 75 =678 380 - 77 =303464 - 15 =449 961 - 28 =933 770 - 47 =723 844 - 55 =789433 - 94 =339 237 - 69 =168 311 - 56 =255 255 - 28 =227443 - 26 =417 364 - 68 =296 656 - 98 =558 281 - 88 =193875 - 68 =807 345 - 88 =257 374 - 48 =326 242 - 67 =175----------------------------练习(八)答案-----------------------------428 - 49 =379 410 - 86 =324 784 - 27 =757 468 - 29 =439372 - 33 =339 723 - 94 =629 916 - 68 =848 220 - 59 =161774 - 26 =748 227 - 38 =189 875 - 99 =776 551 - 73=478205 - 48 =157 812 - 37 =775 297 - 59 =238 407 - 38 =369220 - 43 =177 314 - 58 =256 746 - 88 =658 248 - 89 =159277 - 18 =259 602 - 68 =534 656 - 98 =558 747 - 58 =689637 - 78 =559 454 - 45 =409 744 - 67 =677 491 - 48 =443543 - 68 =475 864 - 57 =807 268 - 59 =209 714 - 68 =646784 - 79 =705 180 - 77 =103 161 - 68 =93 483 - 86 =397717 - 88 =629 440 - 45 =395 732 - 88 =644 175 - 58 =117372 - 43 =329 287 - 39 =248 303 - 29 =274 838 - 79 =759167 - 38 =129 787 - 28 =759 717 - 39 =678 614 - 36 =578482 - 96 =386 274 - 68 =206 824 - 68 =756 377 - 48 =329736 - 68 =668 435 - 27 =408 846 - 39 =807 721 - 59 =662416 - 78 =338 627 - 69 =558 964 - 48 =916 820 - 56 =764618 - 79 =539 187 - 78 =109 483 - 46 =437 837 - 78 =759466 - 38 =428 551 - 83 =468 211 - 45 =166 770 - 43 =727762 - 39 =723 505 - 87 =418 538 - 49 =489 761 - 86=675753 - 14 =739 568 - 79 =489 721 - 12 =709 610 - 95 =515422 - 16 =406 425 - 66 =359 123 - 26 =97 862 - 96 =766 ----------------------------练习(九)答案------------------------------261 - 54 =207 184 - 86 =98 348 - 49 =299 556 - 59 =497481 - 92 =389 447 - 39 =408 750 - 38 =712 243 - 46 =197946 - 68 =878 655 - 67 =588 164 - 95 =69 567 - 49 =518633 - 86 =547 952 - 34 =918 835 - 27 =808 632 - 19 =613543 - 95 =448 305 - 57 =248 718 - 59 =659 407 - 49 =358241 - 13 =228 337 - 79 =258 323 - 88 =235 871 - 88 =783214 - 95 =119 576 - 87 =489 548 - 59 =489 674 - 78 =596314 - 38 =276 767 - 99 =668 981 - 34 =947 243 - 36 =207260 - 25 =235 841 - 39 =802 274 - 26 =248 765 - 99 =666463 - 78 =385 316 - 47 =269 886 - 28 =858 161 - 79 =82311 - 87 =224 211 - 84 =127 486 - 58 =428 612 - 77 =535275 - 67 =208 872 - 85 =787 115 - 88 =27 906 - 78 =828442 - 34 =408 884 - 27 =857 360 - 65 =295 294 - 47 =247832 - 95 =737 727 - 39 =688 884 - 38 =846 465 - 88 =377717 - 28 =689 211 - 33 =178 240 - 52 =188 187 - 88 =99831 - 46 =785 957 - 48 =909 322 - 16 =306 275 - 67 =208574 - 29 =545 911 - 67 =844 710 - 85 =625 252 - 84 =168152 - 56 =96 148 - 39 =109 604 - 89 =515 876 - 89 =787214 - 46 =168 756 - 57 =699 750 - 59 =691 277 - 88 =189726 - 48 =678 295 - 38 =257 898 - 49 =849 217 - 88 =129-----------------------------练习(十)答案------------------------------176 - 78 =98 310 - 27 =283 494 - 88 =406 832 - 87 =745683 - 67 =616 715 - 68 =647 771 - 63 =708 137 - 78 =59 114 - 28 =86 821 - 95 =726 232 - 25 =207 615 - 98 =517815 - 76 =739 632 - 85 =547 950 - 29 =921 953 - 89 =864465 - 58 =407 735 - 86 =649 643 - 44 =599 225 - 47 =178222 - 54 =168 360 - 45 =315 642 - 66 =576 764 - 75 =689334 - 17 =317 768 - 59 =709 536 - 57 =479 181 - 96 =85330 - 65 =265 743 - 97 =646 488 - 89 =399 875 - 77 =798448 - 79 =369 117 - 89 =28 671 - 79 =592 815 - 48 =767234 - 99 =135 630 - 43 =587 222 - 73 =149 287 - 79 =208411 - 27 =384 585 - 58 =527 762 - 96 =666 945 - 58 =887114 - 98 =16 803 - 66 =737 284 - 87 =197 402 - 46 =356354 - 57 =297 642 - 57 =585 236 - 18 =218 447 - 89 =358940 - 67 =873 430 - 32 =398 796 - 78 =718 900 - 97 =803885 - 38 =847 276 - 29 =247 562 - 65 =497 631 - 42 =589325 - 28 =297 871 - 73 =798 465 - 36 =429 257 - 78 =179454 - 35 =419 977 - 89 =888 671 - 32 =639 361 - 62=299626 - 48 =578 778 - 79 =699 366 - 39 =327 944 - 76 =868456 - 88 =368 460 - 47 =413 648 - 79 =569 572 - 18 =554234 - 99 =135 341 - 78 =263 380 - 36 =344 245 - 28 =217。

三位数减两三位数的退位减法

三位数减两三位数的退位减法
江苏省电化教育馆制作
练习
1.先找出错在哪里,再改正过来。
338 -1 9 5
14 3
931 -8 9 4
37
526 -2 2 7
2 99
2.大象的身高是多少厘米? 我的身高是 610厘米。
我比长颈鹿矮 370厘米。
610-370=240(厘米)
答:大象的身高是240厘米。
3.春江公园举行花展,其中三种花的数量 如下表。
减法如何验算?
剩下的本数与借 出的本数合起
来,应该等于原来 的本数
可用加法 验算减法
+ 93
百十 个
· 2 15 - 93
12 2
验 122 算 +1 9 3
21 5
课堂归纳
三位数减两、三位数,要注意:
• 1.相同数位对齐。 • 2.从个位算起。 • 3.哪一位上的数不够减,
从前一位“借1当10”再减
月季
数量 248盆 260盆 316盆
你能提出哪些用减法计算的问题?
课堂小结 三位数减两、三位数,要注意: (1)相同的数位对齐; (2)从个位减起; (3)哪一位上的数不够减,要从前一位退1
当10,加本位上的数后再减。 (4)减法的验算方法:用差加减数,看结果
是否等于被减数。
在 里填上合适的数。
试一试:
用竖式计算643-580 、764-429,并验算。
643-580= 63
6 4 3 验算: 6 3
-580
+ 580
63
643
764-429= 335
7 6 4 验算: 3 3 5
-429
+ 429
335
764
算一算: 347 972 670 -2 5 1 - 8 5 -2 7 3

《退位减法》两三位数的加法和减法

《退位减法》两三位数的加法和减法

06
练习题及答案
两三位数的加法练习题及答案
练习题1:999 + 888 = ?
01
02
答案1:1887
练习题2:765 + 456 = ?
03
04
答案2:1221
练习题3:543 + 219 = ?
05
06
答案3:762
两三位数的减法练习题及答案
练习题1:789 - 456 = ?
01Βιβλιοθήκη 答案1:33302
练习题2:567 - 234 = ?
03
答案2:333
04
练习题3:456 - 123 = ?
05
答案3:333
06
感谢您的观看
THANKS
详细描述
例如,456-239,从个位开始减,6-9不够减,需要从百 位借1,变成16-9=7,十位上5被借了1,变成4-3=1, 百位上4被借了1,变成3-2=1,所以456-239=217。
四位数的退位减法实例
总结词
四位数及以上的退位减法与三位数类似,口诀依然是“借一当十”。
详细描述
例如,5678-2345,从个位开始减,8-5够减,直接相减得到结果3,十位上7-4够减,直接相减得到结果3, 百位上6-3够减,直接相减得到结果3,千位上5-2够减,直接相减得到结果3,所以5678-2345=3333。
详细描述
在进行两三位数的加法运算时,首先需要将两个数的数位对齐。例如,在计算 23+35时,需要将十位对齐,再将个位对齐。从低位开始相加,即先3+5=8,再 2+3=5,最后将两个结果相加得到85。
十位相加
总结词
在进行两三位数的加法运算时,需要先计 算十位的数值,再计算个位的数值。

人教版-数学-三年级上册-《三位数减两、三位数》知识讲解 三位教减两位数的连续退位减法

人教版-数学-三年级上册-《三位数减两、三位数》知识讲解 三位教减两位数的连续退位减法

小学-数学-打印版
小学-数学-打印版 1 三位教减两位数的连续退位减法
问题导入 2005年生产国产电视动画片86部,2011年生产国产电视动画片435部。

2005年比2011年少生产多少部动画片?(教材41页例2)
过程讲解
1.理解题意并列式
2005年生产86部动画片,2011年生产435部动画片,求2005年比2011年少生产多少部动画片,就是求86比435少多少,用减法计算,列式为435-86。

2.探究435 -86的笔算方法
4 3
5 - 8
6 →
9
⇓ 4
3 5 - 8 6 →
4 9

4
3 5 - 8 6 → 3
4 9
3.正确解答
435-86=349(部)
答:2005年比2011年少生产349部动画片。

归纳总结
三位数减两位数的连续退位减法的计算方法:相同教位对齐,从个位减起,哪一位上的数不够减,要从前一位退1当10,加上本位上的数再减。

拓展提高
三位数减三位数的计算方法同样适用于多位数减多位数。

如;
6
3 2 8 - 5
4 3 9
8 8 9
知识巧记 退位减法要牢记,先从个位来减起。

哪位不够前住退,本位加10莫忘记。

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