三位数乘两位数的口算
三位数乘两位数口算教案
三位数乘两位数教学目标知识与能力结合具体情境，理解两位数乘一位数、整百数乘整十数口算的基本方法和算理，体验其口算方法的多样化，并能正确地进行口算，形成一定的计算能力。
过程与方法1.在解决实际问题的过程中，让学生经历发现两位数乘一位数、正柏树乘整十数口算的今本方法的全过程。
2.通过对各种方法的比较，能寻找最佳或最适合自己的方法，培养学生优化策略的思想方法。
情感、态度与价值观1.在解决简单问题的过程中，体验数学与生活的联系，感受数学的价值。
2.培养学生在自主探索、合作交流的活动中，进一步体验数学学习的乐趣，获取成功的体验。
教学重难点重点1.体验口算方法的多养活，并能正确地进行口算。
难点整百数乘整十数口算的算理。
教学设计一、创设情境，激趣导入谈话：奥运会是备受人们关注的世界体育盛会，特别是2008年的北京奥运会更为全民关注。
青岛作为2008年北京奥运会的和办成事，在筹备的过程中做啦大量的工作。
（出示信息窗1上半部分呈现的海上竞渡情境）1.学生读信息请大家继续欣赏图片提问:谁能说说你从这一幅图片中得到了哪些信息？（教师摘要板书）（1）已经工作了3个月，平均每个月挖出淤泥18万吨。
（2）泥驳船每次运走400吨淤泥，本月运了20次。
2.根据信息提出问题。
提问：根据我们得到的这些数学信息，你能提出什么数学问题呢？学生提问题教师把本节课要重点解决的问题板书在黑板上并与板书的数学信息相对应，构成应用题结构。
已经工作了三个月，平均每个月挖出淤泥18万吨，3个月一共挖出淤泥多少万吨？泥驳船每次运走400吨淤泥，本月运了20次，这艘泥驳船本月运了多少次?（学生齐读题）(设计意图：带领学生欣赏信息窗的图画，并从中搜集有关的数学信息，引导学生根据已知的信息提出问题，培养学生的问题意识。
)二、体验感悟，快乐分享1.学生自主探索我们先解决第一个问题，三个月挖出多少万吨淤泥？你会怎样列式？（学生在练习本上列算式）指名回答，教师板书：18×3＝（万吨）谈话：你能很快算出结果吗？学生尝试口算，指明不同想法的学生说一说他的思考过程。
三位数乘以两位数口算讲解
三位数乘以两位数的口算方法如下：
1 先将乘数的第一位数与被乘数的每一位数相乘，得到的积依次写
在被乘数的每一位右侧。
如果有进位，则将进位写在下一位的左侧。
2 再将乘数的第二位数与被乘数的每一位数相乘，得到的积依次写
在被乘数的每一位的左侧。
如果有进位，则将进位写在下一位的左侧。
3 最后将两步得到的乘积相加，得到最终的结果。
举个例子，对于三位数456和两位数78的乘积，可以这样计算：
1 先将乘数的第一位数8与被乘数的每一位数相乘，得到的积依次
写在被乘数的每一位右侧。
456*8=3648，写成这样：
4|6|4|8
2 再将乘数的第二位数7与被乘数的每一位数相乘，得到的积依次
写在被乘数的每一位的左侧。
456*7=3192，写成这样：
3|1|9|2
3 最后将两步得到的乘积相加，得到最终的结果。
4|6|4|8
3|1|9|2
3|8|4|0
因此，456*78=3840。
需要注意的是，在口算过程中要注意计算的顺序，并且要细心核对计算结果，避免出现错误。
三位数乘两位数口算乘法
山
25×2= 50
2×380= 760
130×5=650 24×3= 72
14×6= 84
第一关 18×4= 72
小兔子回家
68
630
96
4×17= 12×8= 70×9=
900
300×3=
82
480
720
92
23×4= 1×240=
第二关
240
700
280×3= 840
这艘泥驳船本周已经运走淤泥 多少吨？
18×3= 54（千米）
方法一 先把个位数和十位数分开乘， 方法二 再把两个积加起来。
8×3=24 30+24=54 10×3=30 在心中想乘法竖式。
1 8 × 3 5 4
方法三
直接口算
18×3= 5 4 2
答：人骑自行车3小时可以行48千米。
方法三
小
结：
1、从多位数的个位算起。 2、口诀加进位。
三位数乘两位数 （口算乘法）
崇阳二小
直接写得数，看谁又准又快。 7×8 3×6 5×9 6×2 8×4 8×8 9×3 4×6 = = = = = = = = 8×9= 20×3= 90÷3= 12×2= 9×5= 4×6= 20×4= 20×6=
你能提出什么问题？
• 3个月挖出多少万吨淤泥？
试练： 18 7 0
2
19×3= 5 7
2
•400×20
特快列车3小时 可以行多少千米？
特快列车1小时约行160千米。
1 160×3= 4 8 0
(千米)
答：特快列车3小时可以行480千米。
智慧城堡
加油啊！
7×13= 91
150×6= 900
登
四年级上册口算题(三位数乘两位数) 3000题
530 × 15 =103 × 60 =800 × 10 =100 × 35 =280 × 30 =990 × 10 =898 × 10 =125 × 70 =510 × 10 =154 × 50 =252 × 28 =400 × 20 =180 × 10 =111 × 10 =123 × 50 =162 × 40 =120 × 44 =40 × 80 =360 × 20 =552 × 10 =472 × 20 =140 × 31 =272 × 10 =660 × 14 =912 × 10 =150 × 10 =300 × 10 =658 × 10 =239 × 37 =505 × 18 =423 × 16 =262 × 10 =235 × 40 =490 × 10 =550 × 16 =200 × 22 =136 × 45 =80 × 20 =432 × 10 =243 × 16 =310 × 20 =379 × 20 =127 × 25 =190 × 40 =355 × 19 =练习范围：三位数乘两位数 题数：100月日姓名: 分秒成绩:540 × 10 =160 × 30 =408 × 10 = 100 × 80 =953 × 10 =210 × 44 = 500 × 10 =102 × 40 =165 × 32 = 688 × 11 =911 × 10 =576 × 10 = 304 × 25 =160 × 50 =114 × 73 = 515 × 10 =470 × 10 =578 × 10 = 541 × 10 =170 × 28 =954 × 10 = 728 × 10 =335 × 10 =650 × 10 = 184 × 26 =630 × 15 =315 × 30 = 200 × 50 =331 × 10 =199 × 26 = 420 × 15 =100 × 20 =129 × 50 = 218 × 10 =335 × 12 =410 × 20 = 280 × 12 =600 × 10 =120 × 53 = 215 × 23 =200 × 20 =140 × 13 = 270 × 30 =580 × 10 =500 × 20 = 100 × 70 =930 × 10 =175 × 46 = 160 × 60 =330 × 24 =150 × 56 = 900 × 10 =565 × 10 =100 × 90 = 265 × 10 =720 × 10 =246 × 36 =390 × 13 =223 × 40 =199 × 26 =103 × 90 =156 × 60 =235 × 40 =290 × 14 =280 × 30 =160 × 23 =80 × 20 =424 × 15 =290 × 17 =140 × 24 =820 × 10 =250 × 20 =310 × 28 =335 × 12 =162 × 40 =336 × 10 =312 × 31 =148 × 20 =175 × 46 =10 × 50 =129 × 54 =595 × 12 =184 × 26 =359 × 25 =198 × 13 =990 × 10 =331 × 10 =953 × 10 =410 × 17 =400 × 10 =285 × 20 =100 × 84 =140 × 60 =400 × 20 =150 × 40 =155 × 60 =262 × 10 =160 × 60 =134 × 40 =140 × 31 =练习范围：三位数乘两位数 题数：100月日姓名: 分秒成绩:631 × 10 =195 × 36 =236 × 40 = 258 × 33 =200 × 30 =392 × 25 = 913 × 10 =240 × 30 =152 × 42 = 600 × 10 =464 × 20 =106 × 10 = 120 × 44 =370 × 18 =550 × 10 = 688 × 11 =470 × 12 =440 × 10 = 435 × 20 =363 × 20 =162 × 60 = 630 × 10 =230 × 37 =200 × 24 = 142 × 30 =100 × 80 =431 × 10 = 341 × 25 =675 × 10 =265 × 30 = 390 × 10 =380 × 10 =180 × 11 = 120 × 75 =132 × 20 =190 × 40 = 246 × 30 =634 × 10 =385 × 14 = 114 × 73 =430 × 20 =300 × 10 = 295 × 10 =165 × 20 =270 × 23 = 129 × 50 =700 × 10 =224 × 28 = 149 × 33 =250 × 40 =180 × 30 = 218 × 10 =475 × 17 =225 × 10 = 158 × 60 =590 × 10 =137 × 60 =210 × 44 =410 × 20 =688 × 11 =400 × 14 =470 × 12 =224 × 28 =199 × 26 =550 × 10 =556 × 15 =120 × 56 =934 × 10 =335 × 12 =334 × 20 =400 × 10 =180 × 20 =190 × 40 =149 × 10 =330 × 10 =141 × 68 =869 × 10 =240 × 20 =552 × 10 =304 × 25 =516 × 15 =630 × 15 =953 × 10 =149 × 55 =200 × 20 =100 × 90 =192 × 50 =300 × 10 =359 × 25 =80 × 20 =898 × 10 =560 × 10 =290 × 14 =175 × 46 =431 × 10 =390 × 10 =119 × 60 =158 × 60 =110 × 70 =149 × 50 =练习范围：三位数乘两位数 题数：100月日姓名: 分秒成绩:655 × 12 =460 × 15 =262 × 10 = 108 × 20 =90 × 20 =300 × 20 = 530 × 10 =630 × 10 =161 × 29 = 520 × 12 =755 × 10 =125 × 70 = 310 × 25 =600 × 10 =149 × 33 = 262 × 34 =230 × 40 =100 × 80 = 100 × 35 =212 × 10 =958 × 10 = 633 × 12 =181 × 20 =160 × 10 = 258 × 20 =280 × 30 =246 × 30 = 490 × 10 =184 × 26 =190 × 38 = 132 × 20 =270 × 23 =310 × 28 = 388 × 10 =103 × 90 =200 × 10 = 100 × 60 =134 × 60 =565 × 10 = 162 × 40 =235 × 40 =577 × 11 = 140 × 31 =214 × 20 =198 × 13 = 121 × 63 =160 × 60 =990 × 10 = 100 × 84 =250 × 40 =130 × 21 = 230 × 30 =660 × 14 =120 × 83 = 165 × 32 =820 × 10 =368 × 24 =135 × 30 =750 × 13 =470 × 12 =165 × 32 =158 × 60 =755 × 10 =280 × 30 =901 × 10 =800 × 10 =680 × 10 =150 × 40 =140 × 60 =300 × 20 =930 × 10 =630 × 15 =530 × 11 =500 × 15 =700 × 10 =300 × 30 =304 × 25 =965 × 10 =100 × 70 =108 × 25 =132 × 10 =240 × 11 =300 × 10 =100 × 35 =246 × 36 =160 × 23 =134 × 10 =500 × 20 =260 × 30 =236 × 20 =250 × 40 =130 × 23 =410 × 17 =180 × 10 =280 × 12 =100 × 84 =600 × 10 =900 × 10 =370 × 16 =120 × 53 =练习范围：三位数乘两位数 题数：100月日姓名: 分秒成绩:257 × 27 =178 × 25 =390 × 13 = 295 × 22 =270 × 35 =370 × 20 = 550 × 16 =100 × 50 =740 × 10 = 110 × 70 =145 × 10 =355 × 19 = 180 × 30 =257 × 10 =700 × 11 = 328 × 22 =230 × 24 =114 × 73 = 200 × 40 =950 × 10 =224 × 28 = 125 × 70 =400 × 20 =130 × 21 = 140 × 31 =149 × 33 =331 × 10 = 210 × 44 =90 × 60 =170 × 20 = 123 × 50 =370 × 14 =120 × 74 = 380 × 26 =180 × 20 =898 × 10 = 200 × 10 =184 × 26 =103 × 90 = 217 × 10 =688 × 11 =290 × 14 = 892 × 10 =165 × 20 =262 × 10 = 120 × 22 =90 × 80 =660 × 14 = 195 × 36 =400 × 14 =129 × 50 = 180 × 11 =270 × 23 =199 × 26 = 305 × 26 =103 × 90 =110 × 52 =410 × 17 =624 × 10 =540 × 10 =290 × 14 =100 × 90 =374 × 21 =180 × 40 =195 × 15 =20 × 30 =930 × 10 =160 × 14 =335 × 20 =217 × 10 =326 × 20 =280 × 12 =100 × 70 =400 × 20 =755 × 10 =310 × 28 =262 × 10 =331 × 10 =410 × 20 =224 × 28 =112 × 65 =110 × 68 =160 × 60 =243 × 16 =917 × 10 =898 × 10 =246 × 36 =350 × 10 =475 × 17 =195 × 36 =647 × 10 =162 × 40 =470 × 12 =688 × 11 =235 × 40 =130 × 53 =104 × 82 =240 × 16 =132 × 20 =408 × 10 =练习范围：三位数乘两位数 题数：100月日姓名: 分秒成绩:160 × 23 =120 × 55 =700 × 10 = 198 × 34 =740 × 12 =160 × 30 = 900 × 10 =140 × 31 =104 × 40 = 390 × 10 =199 × 26 =355 × 19 = 230 × 34 =100 × 20 =410 × 12 = 90 × 40 =500 × 20 =270 × 31 = 190 × 10 =338 × 25 =600 × 10 = 390 × 13 =100 × 80 =197 × 40 = 928 × 10 =631 × 10 =310 × 22 = 469 × 16 =129 × 50 =252 × 30 = 130 × 70 =184 × 26 =130 × 21 = 630 × 15 =240 × 30 =115 × 50 = 550 × 10 =466 × 10 =380 × 10 = 630 × 10 =336 × 10 =198 × 13 = 260 × 20 =431 × 10 =343 × 23 = 180 × 10 =633 × 12 =182 × 45 = 300 × 20 =300 × 10 =652 × 15 = 149 × 33 =214 × 30 =492 × 18 = 472 × 20 =468 × 20 =200 × 40 =103 × 90 =660 × 14 =140 × 51 =125 × 70 =240 × 26 =493 × 12 =140 × 65 =624 × 15 =180 × 10 =100 × 84 =180 × 11 =184 × 26 =130 × 21 =431 × 10 =210 × 44 =50 × 10 =953 × 10 =20 × 10 =320 × 26 =199 × 26 =120 × 53 =630 × 10 =470 × 12 =755 × 10 =239 × 32 =270 × 23 =631 × 10 =782 × 10 =175 × 46 =688 × 11 =160 × 23 =120 × 44 =363 × 21 =500 × 20 =200 × 20 =134 × 40 =120 × 80 =280 × 12 =200 × 27 =110 × 70 =232 × 10 =180 × 20 =130 × 20 =练习范围：三位数乘两位数 题数：100月日姓名: 分秒成绩:800 × 10 =140 × 60 =200 × 10 = 218 × 10 =120 × 83 =359 × 25 = 892 × 10 =335 × 12 =243 × 16 = 10 × 80 =330 × 24 =140 × 27 = 246 × 30 =331 × 10 =336 × 10 = 633 × 12 =490 × 16 =245 × 14 = 162 × 40 =540 × 10 =270 × 29 = 100 × 90 =100 × 20 =217 × 10 = 460 × 20 =418 × 17 =310 × 10 = 330 × 10 =150 × 40 =114 × 75 = 280 × 20 =280 × 30 =123 × 50 = 200 × 50 =165 × 32 =160 × 20 = 198 × 13 =235 × 40 =380 × 20 = 156 × 20 =200 × 30 =410 × 20 = 110 × 40 =150 × 10 =190 × 50 = 174 × 56 =900 × 10 =132 × 20 = 472 × 20 =820 × 10 =990 × 10 = 750 × 12 =460 × 10 =235 × 30 = 129 × 50 =120 × 83 =198 × 13 =837 × 11 =200 × 10 =409 × 20 =120 × 53 =892 × 10 =410 × 17 =100 × 60 =116 × 30 =552 × 10 =310 × 28 =180 × 16 =180 × 20 =125 × 70 =550 × 16 =565 × 10 =990 × 10 =120 × 20 =160 × 60 =408 × 10 =199 × 26 =200 × 20 =720 × 12 =243 × 16 =160 × 20 =336 × 10 =325 × 30 =165 × 20 =390 × 13 =184 × 26 =105 × 80 =316 × 25 =260 × 16 =246 × 36 =100 × 22 =280 × 34 =145 × 66 =224 × 28 =110 × 18 =620 × 13 =100 × 20 =130 × 21 =280 × 30 =122 × 45 =练习范围：三位数乘两位数 题数：100月日姓名: 分秒成绩:110 × 70 =470 × 12 =129 × 50 = 320 × 14 =390 × 10 =140 × 50 = 216 × 34 =130 × 60 =160 × 30 = 195 × 32 =140 × 20 =270 × 23 = 898 × 10 =198 × 49 =70 × 40 = 140 × 10 =900 × 10 =170 × 55 = 130 × 69 =100 × 35 =700 × 10 = 630 × 10 =885 × 10 =50 × 80 = 400 × 20 =196 × 26 =334 × 23 = 210 × 10 =335 × 12 =510 × 19 = 332 × 25 =560 × 12 =755 × 10 = 331 × 10 =130 × 41 =410 × 20 = 260 × 15 =820 × 10 =390 × 16 = 314 × 10 =100 × 84 =500 × 17 = 633 × 12 =206 × 40 =217 × 10 = 160 × 46 =600 × 10 =598 × 13 = 120 × 64 =150 × 20 =160 × 23 = 688 × 11 =660 × 14 =720 × 10 = 149 × 33 =149 × 33 =445 × 18 =330 × 24 =675 × 10 =160 × 23 =196 × 45 =660 × 14 =345 × 16 =100 × 35 =953 × 10 =150 × 50 =40 × 40 =470 × 12 =331 × 10 =100 × 30 =140 × 31 =480 × 10 =175 × 46 =400 × 20 =612 × 15 =380 × 10 =350 × 13 =313 × 30 =180 × 11 =100 × 60 =500 × 17 =299 × 30 =160 × 15 =122 × 80 =990 × 10 =198 × 34 =204 × 33 =150 × 37 =246 × 36 =150 × 38 =304 × 25 =167 × 30 =150 × 40 =330 × 25 =266 × 15 =634 × 10 =631 × 10 =472 × 20 =239 × 37 =196 × 32 =练习范围：三位数乘两位数 题数：100月日姓名: 分秒成绩:280 × 12 =431 × 10 =198 × 13 = 335 × 12 =230 × 38 =103 × 90 = 100 × 40 =130 × 21 =115 × 78 = 195 × 36 =100 × 52 =60 × 20 = 165 × 20 =426 × 10 =217 × 10 = 839 × 10 =600 × 10 =230 × 43 = 250 × 40 =200 × 10 =120 × 34 = 200 × 20 =100 × 84 =262 × 10 = 116 × 20 =159 × 30 =290 × 20 = 123 × 50 =117 × 49 =130 × 10 = 70 × 20 =220 × 33 =630 × 15 = 536 × 10 =310 × 28 =185 × 10 = 120 × 83 =633 × 12 =280 × 30 = 770 × 10 =90 × 10 =136 × 65 = 143 × 40 =300 × 30 =410 × 17 = 145 × 55 =506 × 10 =210 × 26 = 80 × 50 =270 × 23 =110 × 39 = 380 × 18 =195 × 28 =235 × 40 = 430 × 15 =330 × 24 =863 × 10 =165 × 20 =552 × 10 =210 × 30 =160 × 60 =80 × 20 =160 × 58 =228 × 15 =475 × 17 =130 × 72 =100 × 50 =195 × 36 =170 × 30 =990 × 10 =336 × 10 =199 × 26 =930 × 10 =115 × 30 =410 × 17 =500 × 10 =633 × 12 =198 × 13 =214 × 30 =217 × 10 =180 × 11 =631 × 10 =400 × 20 =170 × 44 =162 × 40 =210 × 44 =175 × 46 =580 × 14 =129 × 50 =200 × 16 =630 × 10 =250 × 35 =318 × 30 =224 × 28 =235 × 40 =153 × 30 =820 × 10 =100 × 90 =100 × 40 =130 × 21 =练习范围：三位数乘两位数 题数：100月日姓名: 分秒成绩:198 × 34 =160 × 23 =180 × 10 = 700 × 10 =246 × 36 =110 × 65 = 220 × 43 =630 × 15 =152 × 30 = 500 × 20 =335 × 12 =120 × 83 = 270 × 15 =487 × 20 =390 × 13 = 100 × 20 =898 × 10 =100 × 84 = 344 × 10 =182 × 45 =244 × 10 = 120 × 44 =225 × 14 =717 × 10 = 250 × 20 =800 × 10 =550 × 16 = 123 × 50 =410 × 20 =140 × 60 = 270 × 23 =250 × 40 =270 × 20 = 280 × 20 =472 × 20 =158 × 17 = 145 × 46 =550 × 10 =170 × 10 = 892 × 10 =264 × 35 =932 × 10 = 688 × 11 =796 × 10 =400 × 14 = 200 × 10 =307 × 24 =280 × 12 = 320 × 20 =154 × 49 =138 × 12 = 150 × 43 =200 × 30 =431 × 10 = 132 × 20 =550 × 10 =190 × 50 =688 × 11 =50 × 40 =410 × 11 =800 × 10 =110 × 28 =500 × 10 =110 × 10 =345 × 22 =239 × 11 =180 × 36 =125 × 70 =400 × 10 =930 × 10 =410 × 20 =246 × 30 =224 × 28 =383 × 25 =900 × 10 =470 × 12 =40 × 60 =199 × 26 =200 × 20 =120 × 44 =408 × 10 =170 × 26 =158 × 60 =135 × 56 =240 × 30 =100 × 40 =168 × 45 =180 × 10 =400 × 14 =162 × 40 =560 × 15 =898 × 10 =953 × 10 =500 × 20 =540 × 10 =312 × 25 =239 × 37 =114 × 10 =100 × 10 =175 × 46 =练习范围：三位数乘两位数 题数：100月日姓名: 分秒成绩:136 × 70 =335 × 12 =165 × 32 = 244 × 40 =130 × 40 =100 × 20 = 582 × 15 =700 × 10 =149 × 33 = 246 × 36 =120 × 83 =471 × 16 = 30 × 30 =243 × 16 =240 × 26 = 130 × 21 =100 × 84 =600 × 10 = 100 × 35 =336 × 10 =520 × 10 = 625 × 11 =200 × 50 =670 × 10 = 331 × 10 =482 × 15 =169 × 11 = 250 × 40 =123 × 50 =298 × 10 = 552 × 10 =235 × 10 =200 × 30 = 431 × 10 =110 × 70 =272 × 30 = 380 × 10 =410 × 18 =300 × 10 = 280 × 12 =685 × 14 =550 × 16 = 263 × 33 =146 × 20 =210 × 44 = 130 × 75 =565 × 10 =125 × 50 = 100 × 70 =510 × 10 =160 × 23 = 184 × 26 =633 × 12 =321 × 30 = 165 × 20 =400 × 20 =690 × 10 =280 × 12 =470 × 10 =200 × 20 =130 × 42 =550 × 10 =230 × 42 =149 × 33 =472 × 20 =660 × 14 =540 × 10 =195 × 36 =970 × 10 =60 × 70 =159 × 54 =181 × 22 =103 × 90 =102 × 96 =243 × 16 =410 × 17 =270 × 23 =242 × 40 =552 × 10 =150 × 56 =198 × 34 =180 × 10 =500 × 20 =160 × 41 =214 × 30 =30 × 80 =747 × 13 =100 × 35 =290 × 14 =251 × 39 =630 × 15 =255 × 12 =210 × 30 =114 × 73 =410 × 20 =246 × 36 =160 × 30 =110 × 81 =633 × 12 =105 × 28 =练习范围：三位数乘两位数 题数：100月日姓名: 分秒成绩:170 × 50 =645 × 13 =514 × 16 = 304 × 25 =90 × 80 =990 × 10 = 120 × 44 =198 × 13 =380 × 10 = 600 × 10 =390 × 10 =262 × 10 = 540 × 18 =631 × 10 =550 × 16 = 335 × 12 =123 × 50 =490 × 15 = 250 × 26 =898 × 10 =144 × 30 = 165 × 32 =314 × 20 =103 × 43 = 197 × 30 =241 × 40 =80 × 20 = 100 × 45 =162 × 40 =217 × 10 = 415 × 18 =239 × 37 =120 × 70 = 140 × 60 =688 × 11 =210 × 13 = 900 × 10 =235 × 40 =200 × 40 = 630 × 10 =100 × 20 =246 × 30 = 302 × 13 =130 × 21 =555 × 12 = 800 × 10 =210 × 22 =359 × 25 = 232 × 40 =660 × 10 =120 × 35 = 820 × 10 =132 × 20 =431 × 10 = 418 × 20 =210 × 44 =200 × 20 =306 × 20 =290 × 14 =892 × 10 =262 × 10 =500 × 20 =155 × 48 =630 × 10 =152 × 45 =550 × 10 =160 × 60 =338 × 25 =755 × 10 =350 × 10 =431 × 10 =90 × 60 =630 × 15 =275 × 34 =355 × 19 =330 × 25 =200 × 32 =186 × 30 =114 × 73 =626 × 12 =824 × 10 =164 × 60 =400 × 20 =122 × 75 =140 × 30 =359 × 25 =100 × 20 =460 × 16 =200 × 40 =100 × 84 =280 × 22 =175 × 46 =103 × 90 =250 × 40 =565 × 10 =246 × 30 =159 × 57 =235 × 40 =400 × 10 =234 × 15 =练习范围：三位数乘两位数 题数：100月日姓名: 分秒成绩:414 × 16 =148 × 34 =700 × 10 = 199 × 26 =109 × 50 =100 × 60 = 528 × 17 =150 × 42 =227 × 30 = 333 × 30 =120 × 44 =198 × 13 = 180 × 11 =280 × 12 =552 × 10 = 408 × 10 =132 × 20 =198 × 34 = 107 × 20 =732 × 10 =290 × 31 = 212 × 35 =157 × 40 =450 × 20 = 220 × 18 =820 × 10 =540 × 10 = 170 × 28 =880 × 10 =80 × 20 = 898 × 10 =660 × 10 =239 × 37 = 110 × 70 =390 × 13 =186 × 26 = 336 × 10 =548 × 10 =243 × 16 = 430 × 22 =500 × 10 =410 × 17 = 40 × 40 =330 × 24 =218 × 10 = 900 × 10 =100 × 35 =200 × 35 = 104 × 95 =310 × 28 =140 × 31 = 322 × 30 =20 × 90 =550 × 16 = 150 × 40 =120 × 44 =219 × 30 =125 × 70 =565 × 10 =162 × 40 =239 × 37 =540 × 10 =184 × 26 =390 × 10 =108 × 92 =178 × 35 =125 × 78 =520 × 10 =140 × 31 =200 × 20 =165 × 20 =305 × 30 =262 × 10 =100 × 10 =230 × 38 =328 × 19 =108 × 10 =552 × 10 =880 × 10 =110 × 70 =180 × 20 =200 × 12 =144 × 45 =146 × 60 =220 × 21 =320 × 11 =165 × 32 =195 × 36 =180 × 10 =130 × 42 =270 × 23 =114 × 73 =200 × 40 =290 × 16 =455 × 10 =160 × 30 =100 × 80 =633 × 12 =171 × 30 =217 × 10 =练习范围：三位数乘两位数 题数：100月日姓名: 分秒成绩:760 × 10 =100 × 84 =355 × 19 = 164 × 19 =214 × 30 =103 × 90 = 310 × 28 =224 × 30 =892 × 10 = 280 × 30 =246 × 30 =730 × 10 = 200 × 30 =430 × 11 =198 × 13 = 108 × 30 =500 × 14 =898 × 10 = 200 × 50 =120 × 83 =336 × 10 = 470 × 12 =190 × 48 =300 × 29 = 953 × 10 =149 × 33 =443 × 13 = 190 × 30 =110 × 42 =199 × 26 = 500 × 20 =300 × 10 =600 × 10 = 148 × 44 =243 × 16 =320 × 23 = 660 × 14 =642 × 13 =380 × 10 = 102 × 70 =140 × 30 =123 × 50 = 330 × 24 =304 × 25 =160 × 23 = 265 × 14 =10 × 40 =431 × 10 = 250 × 40 =250 × 11 =150 × 40 = 180 × 11 =231 × 19 =135 × 68 = 400 × 20 =120 × 60 =410 × 20 =550 × 16 =830 × 10 =224 × 28 =390 × 13 =250 × 40 =160 × 30 =174 × 25 =262 × 10 =210 × 44 =688 × 11 =40 × 70 =198 × 34 =587 × 12 =670 × 11 =255 × 30 =562 × 10 =160 × 41 =245 × 36 =500 × 14 =800 × 10 =280 × 12 =135 × 26 =103 × 90 =330 × 24 =150 × 50 =631 × 10 =40 × 20 =400 × 14 =990 × 10 =349 × 26 =100 × 90 =180 × 20 =465 × 12 =168 × 10 =125 × 70 =110 × 70 =175 × 46 =165 × 32 =158 × 60 =152 × 40 =633 × 12 =280 × 30 =335 × 12 =练习范围：三位数乘两位数 题数：100月日姓名: 分秒成绩:210 × 20 =552 × 10 =390 × 10 = 100 × 70 =140 × 60 =150 × 40 = 142 × 70 =223 × 10 =110 × 20 = 100 × 35 =244 × 30 =272 × 20 = 200 × 30 =930 × 10 =892 × 10 = 755 × 10 =875 × 10 =270 × 13 = 200 × 50 =130 × 21 =123 × 50 = 140 × 61 =100 × 30 =408 × 10 = 184 × 26 =106 × 10 =630 × 10 = 360 × 20 =40 × 40 =220 × 44 = 186 × 13 =380 × 10 =474 × 15 = 214 × 30 =587 × 15 =199 × 26 = 218 × 10 =470 × 12 =472 × 20 = 170 × 34 =160 × 11 =711 × 10 = 120 × 64 =336 × 10 =180 × 10 = 565 × 10 =235 × 40 =540 × 10 = 550 × 10 =310 × 28 =110 × 14 = 10 × 60 =165 × 20 =374 × 20 = 130 × 16 =120 × 44 =160 × 60 =160 × 23 =160 × 10 =300 × 30 =250 × 40 =640 × 10 =930 × 10 =120 × 83 =165 × 10 =123 × 50 =990 × 10 =305 × 27 =331 × 30 =139 × 50 =300 × 10 =330 × 24 =180 × 10 =125 × 76 =495 × 16 =103 × 90 =200 × 30 =300 × 20 =200 × 40 =199 × 26 =239 × 37 =400 × 10 =355 × 19 =290 × 14 =825 × 10 =898 × 10 =246 × 30 =477 × 16 =300 × 22 =120 × 53 =113 × 45 =336 × 10 =755 × 10 =50 × 60 =118 × 60 =344 × 12 =40 × 50 =400 × 20 =200 × 50 =328 × 10 =练习范围：三位数乘两位数 题数：100月日姓名: 分秒成绩:390 × 10 =848 × 10 =175 × 46 = 472 × 20 =60 × 70 =140 × 31 = 431 × 10 =384 × 10 =217 × 10 = 408 × 10 =214 × 30 =265 × 18 = 410 × 20 =90 × 10 =688 × 11 = 110 × 11 =114 × 73 =133 × 27 = 380 × 10 =160 × 30 =200 × 20 = 235 × 40 =198 × 34 =290 × 21 = 210 × 44 =165 × 32 =100 × 68 = 470 × 12 =101 × 46 =660 × 14 = 120 × 66 =180 × 11 =630 × 12 = 444 × 20 =450 × 10 =110 × 60 = 800 × 10 =565 × 10 =545 × 15 = 50 × 10 =552 × 10 =184 × 26 = 100 × 80 =100 × 84 =650 × 15 = 150 × 10 =190 × 10 =165 × 20 = 125 × 70 =400 × 14 =162 × 40 = 953 × 10 =147 × 46 =188 × 50 = 600 × 10 =164 × 20 =40 × 40 =200 × 10 =249 × 20 =214 × 30 =100 × 84 =350 × 24 =160 × 30 =120 × 64 =100 × 35 =227 × 22 =470 × 17 =390 × 10 =120 × 83 =184 × 26 =280 × 13 =100 × 80 =100 × 20 =450 × 17 =20 × 50 =180 × 40 =160 × 36 =100 × 50 =164 × 55 =335 × 12 =160 × 33 =165 × 20 =224 × 28 =455 × 10 =148 × 50 =180 × 11 =260 × 10 =181 × 47 =310 × 28 =120 × 53 =900 × 10 =280 × 12 =158 × 60 =115 × 14 =199 × 26 =130 × 21 =600 × 10 =158 × 55 =460 × 16 =129 × 50 =练习范围：三位数乘两位数 题数：100月日姓名: 分秒成绩:102 × 80 =270 × 23 =410 × 20 = 390 × 13 =500 × 20 =210 × 27 = 380 × 12 =228 × 20 =175 × 46 = 140 × 60 =359 × 25 =410 × 17 = 700 × 10 =370 × 23 =130 × 37 = 239 × 10 =475 × 17 =149 × 33 = 177 × 10 =215 × 12 =360 × 26 = 240 × 24 =198 × 13 =100 × 60 = 100 × 97 =336 × 10 =990 × 10 = 239 × 37 =246 × 20 =100 × 10 = 630 × 15 =330 × 24 =123 × 50 = 246 × 36 =110 × 86 =432 × 15 = 312 × 23 =395 × 20 =165 × 32 = 578 × 10 =633 × 12 =125 × 70 = 140 × 40 =120 × 40 =20 × 60 = 150 × 40 =246 × 30 =304 × 25 = 300 × 10 =180 × 30 =162 × 40 = 172 × 30 =484 × 15 =630 × 10 = 196 × 50 =648 × 10 =362 × 15 =880 × 10 =132 × 20 =160 × 30 =304 × 25 =630 × 15 =431 × 10 =130 × 54 =100 × 80 =110 × 78 =190 × 15 =184 × 26 =410 × 20 =129 × 50 =162 × 40 =183 × 50 =647 × 10 =280 × 30 =755 × 10 =800 × 10 =935 × 10 =550 × 10 =114 × 73 =565 × 10 =105 × 48 =310 × 30 =140 × 31 =110 × 10 =330 × 24 =500 × 20 =246 × 30 =410 × 17 =175 × 35 =120 × 62 =100 × 20 =440 × 12 =390 × 13 =640 × 11 =210 × 36 =248 × 25 =218 × 10 =472 × 20 =230 × 10 =224 × 28 =练习范围：三位数乘两位数 题数：100月日姓名: 分秒成绩:248 × 20 =120 × 60 =198 × 13 = 450 × 20 =540 × 10 =688 × 11 = 598 × 10 =336 × 10 =250 × 40 = 168 × 41 =155 × 10 =820 × 10 = 80 × 10 =10 × 30 =660 × 14 = 105 × 82 =303 × 29 =630 × 10 = 160 × 23 =134 × 50 =110 × 70 = 195 × 36 =408 × 10 =214 × 30 = 990 × 10 =900 × 10 =100 × 30 = 240 × 30 =330 × 10 =953 × 10 = 100 × 25 =355 × 19 =130 × 20 = 350 × 15 =200 × 10 =125 × 70 = 246 × 36 =400 × 14 =120 × 44 = 631 × 10 =300 × 20 =130 × 69 = 540 × 14 =380 × 17 =100 × 32 = 152 × 60 =260 × 20 =143 × 68 = 180 × 10 =370 × 18 =100 × 84 = 175 × 46 =840 × 10 =174 × 36 = 217 × 10 =400 × 10 =140 × 31 =146 × 65 =180 × 11 =330 × 24 =140 × 60 =770 × 12 =160 × 60 =300 × 28 =100 × 70 =134 × 50 =400 × 13 =200 × 10 =400 × 14 =498 × 15 =160 × 30 =100 × 20 =842 × 10 =304 × 25 =130 × 32 =228 × 40 =820 × 10 =431 × 10 =220 × 30 =454 × 20 =224 × 28 =199 × 26 =40 × 40 =688 × 11 =235 × 40 =310 × 30 =654 × 15 =258 × 20 =120 × 83 =110 × 30 =930 × 10 =110 × 34 =359 × 25 =130 × 21 =892 × 10 =120 × 44 =470 × 12 =150 × 18 =286 × 30 =267 × 13 =练习范围：三位数乘两位数 题数：100月日姓名: 分秒成绩:695 × 10 =300 × 10 =305 × 13 = 550 × 16 =398 × 15 =246 × 36 = 550 × 10 =80 × 20 =331 × 10 = 565 × 10 =100 × 84 =540 × 10 = 408 × 10 =114 × 57 =118 × 50 = 165 × 32 =900 × 10 =357 × 20 = 630 × 10 =372 × 10 =250 × 40 = 214 × 30 =310 × 28 =127 × 70 = 100 × 80 =198 × 13 =184 × 26 = 280 × 30 =390 × 13 =443 × 20 = 380 × 10 =123 × 50 =262 × 10 = 633 × 12 =494 × 10 =173 × 40 = 701 × 12 =180 × 45 =120 × 63 = 800 × 10 =100 × 90 =190 × 32 = 771 × 10 =320 × 30 =210 × 27 = 216 × 10 =320 × 20 =103 × 90 = 200 × 40 =114 × 73 =198 × 34 = 552 × 10 =180 × 20 =132 × 20 = 770 × 10 =。
三位数乘两位数口算
直接写得数，看谁又准又快。
7×8 = 3×6 = 5×9 = 8×4 = 2×7 = 9×3 = 4×6 =
6×3+2 = 7×5+1 = 8×3+2 = 3×7+5 = 6×8+3 = 3×9+6 = 7×4+4 =
你知道吗？
你还知道其 它交通工具 的速度吗？
人骑自行车1小时 约行16千米。
900
300×3=
82
720
92 23×4= 1×240=
240
第四关
700
480 280×3= 840
神奇的金字塔
8×3= 24 16×3= 48 32×3= 96
60×4= 240 180×4= 720 240×4= 960
第五
王阿姨要买3个这样 的娃娃,她带了100 元，够吗？
48
16×3= 41 8
答：人骑自行车3小时可以行48千米。
方法三 小 结： 1、从多位数的个位算起。 2、口诀加进位。
试练：
18×2= 31 6 14×5= 72 0
12×8= 91 6 19×3= 52 7
160×3= 480 （千米）
答：特快列车3小时可以行480千米。
100×3=300 60×3=180
特快列车1小时约 行160千米。
人骑自行车3小时 可以行多少千米？
16×3=？
160×3=？
特快列车3小时 可 以行多少千米？
16×3= 48（千米）
方法一 先把个位数和十位数分开 方法二 在心中想乘法竖式。
乘，再把两个积加起来。
6×3=18 10×3=30 30+18=48
三位数乘两位数口算题四年级
三位数乘两位数口算题四年级一、口算题。
1. 120×20 =2. 130×30 =3. 140×20 =4. 210×30 =5. 230×20 =6. 320×30 =7. 310×20 =8. 410×20 =9. 420×30 =10. 150×40 =11. 160×30 =12. 250×20 =13. 260×30 =14. 350×20 =15. 360×20 =16. 450×20 =17. 460×30 =18. 510×20 =19. 520×30 =20. 530×20 =二、解析。
1. 对于120×20：- 先计算12×2 = 24，然后因为因数末尾共有2个0，所以在24后面添上2个0，结果为2400。
2. 对于130×30：- 计算13×3 = 39，因数末尾共有2个0，就在39后面添2个0，得到3900。
3. 对于140×20：- 先算14×2 = 28，再添2个0，结果是2800。
4. 对于210×30：- 计算21×3 = 63，然后添2个0，为6300。
5. 对于230×20：- 先算23×2 = 46，添2个0后得4600。
6. 对于320×30：- 计算32×3 = 96，添2个0得到9600。
7. 对于310×20：- 先算31×2 = 62，添2个0为6200。
8. 对于410×20：9. 对于420×30：- 先算42×3 = 126，添2个0结果是12600。
10. 对于150×40：- 计算15×4 = 60，添2个0得到6000。
三位数乘两位数优秀课件
第1课时 三位数乘两位数的笔算乘法
人教版 四年级上册
1. 口算。 23×30＝ 690 42×19≈ 800
47×20＝ 940 58×41≈ 2400
2. 计算。
43×26＝1118 43
× 26 258 86
1118
这是我们学过的两位数 乘两位数的乘法，该怎 样列竖式计算呢？
2、再用两位数十位上的数去乘另一个因数，得数的末 位和两位数的十位对齐。
3、然后把两次乘得的数加起来。
Байду номын сангаас位数乘三位数的乘法法则
1、先用两位数个位上的数去乘另一个因数，得 数的末位和两位数的个位对齐。 2、再用两位数十位上的数去乘另一个因数，得 数的末位和两位数的十位对齐。 3、然后把两次乘得的数加起来。
1. 做一做。
1 34 × 12
268 134 160 8
第二部分积 该怎样写？
2. 做一做。
12×34＝408 12
× 34 48
36 408
我是这样算的：先用第二个因数每一位上的数与第一 个因数相乘，用哪一位上的数去乘，乘得的积的末位 就和那一位对齐，再把两次乘得的积相加。
李叔叔从某城市乘火车去北京用了12小时，火车每小时 行145千米。该城市到北京有多少千米？
145×12＝ 同学们，题目中已知的是
176 × 47
1232 7 04
8272
425 × 36
2550 1275
15300
237 × 82
474 1896
19434
3.
说出下面计算中的错误，
并改正过来。
134 × 16
804 134
134 × 16
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三位数乘两位数的口算
教学目标:
1、结合具体情景掌握两位数乘一位数和整百数乘整十数的口算方法。
2、在具体情景中，应用有关运算解决相应的实际问题，提高解决问题
的能力。
3、在探索算法和解决问题的过程中，感受数学与生活的联系，增强自
主探索的意识，提高合作交流的能力，获得成功的体验，树立学习的信心。
教学重点、难点:
两位数乘一位数和整百数乘整十数的口算方法
课前准备:
申办奥运成功时激动场面的录象资料、投影机、教材信息窗
教学过程:
一、复习导入
1．口答
（1）14是由几个十、几个一组成的？26呢？
（2）14个十、38个十、15个十各是多少？
2．口算：
（1）10×5= 20×3= 13×3= 34×2=
100×7= 200×4= 130×2= 210×3=
（用卡片进行口算练习，同时一位数乘两位数、乘整百整十数各选一题让学生说出口算的具体过程。
）
（2）14×2等于多少？你是怎样口算的？
140×2等于多少？
师：刚才我们复习了用一位数乘的口算，如果老师将复习题14×2改成18×3（板书：18×3），仍然是一道一位数乘两位数的口算题，但和以前学的又不完全相同。
这样的题怎么口算，大家想不想研究？
板书课题：两位数乘一位数、整百整十数乘法的口算。
二、探究新知：
创设情境，导入新课;
师：同学们，你们知道2008年奥帆船、帆板比赛在哪个城市举行吗？引入主题—扬帆奥运。
1、出示情景图：
问：图中给我们提供了哪些信息？
2、根据这些信息，你想提出什么问题？
（1）、3个月一共挖出多少万吨淤泥？（2）、本周已经运走了多少吨淤泥？
3 小组自主合作交流
小组讨论交流自己的想法
解决第一个问题：
已经工作了3 个月，平均每月挖出18 万吨淤泥。
3 个月挖出
多少万吨淤泥? 18×3=54(吨) 10×3=30 3×8=24 30+24=54
把18 看作20 20×3=60 2×3=6 60-6=54 学生能否表达清
楚自己的算法，并能对自己的计算过程作出解释。
尊重学生自己
的选择。
你是怎么想的? 这些想法你最喜欢哪种?
解决第二个问题：
这艘泥驳船每次运走400 吨淤泥，本月已经运了20 次。
生:本
周一共运走淤泥多少吨? 400×20=8000(吨) 4×2=8 400×20=8000
400×2=800 800×10=8000 鼓励学生解决问题策略的多样化
三、巩固练习，拓展应用
师:我们一起来玩一个闯关比赛的游戏，看谁能连闯3 关，那就成为闯关小勇士。
第一关14×3= 12×5= 49×2= 16×4= 200×30= 100×70= 30×300= 10×600=
第二关出示华泰商厦部分商品9 月份日平均销售量统计表。
华泰商厦
9 月份卖出多少张光盘? 你是怎么算的?
第三关估计一下，照这样的销量，库存的1200 台吸尘器能满足10 月份的需求吗?
采用学生所喜欢的和感兴趣的方式来达到巩固练习的目的。
让学
生说出算法，培养分析问题、解决问题的能力。
反馈学生对以上
题目的完成情况，对表现突出的学生及时进行肯定并奖励。
四：总结提升，深化提高。
师:这节课你学会了什么?有哪些收获和不足? 学生用自己的语言谈收获和体会。
学生能用自己的语言表述自己的表现和收获。
板书设计:
两位数乘一位数和整百数乘整十数的口算方法
18×3=54(吨) 10×3=30 3×8=24 30+24=54
400×20=8000 4×2=8 后面加上三个0。