三年级数学下册除法估算练习题39979
人教版三年级数学下册《口算除法估算》
除
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夏老师打算买文具送给 三年（3）班 46个同学， 每套文具是2元。100元 够用吗？
一本故事书有438页，小丽用4个星期看完，小丽每星期 大约看了多少页？
01 练习：
02 79÷8中把79看成（ ），
79÷8≈（
）
03 247÷5中把247看成（ ），
247÷5≈（ ）
04 247÷6中把247看成（ ），
247÷6≈（ ）
练习： 说出下面各题 的商大约是多少
276÷9 ≈ （ ）
118÷4 ≈ （ ）
2214÷7 ≈（
）
175名同 学去春游， 安排4辆 客车接送， 平均每辆 车大约要 坐多少人？
用 650 元买儿童 乐园的门票，每张3 元，大约能买多少 张？够买175人的 门票吗？
2.估算。
÷4 ≈ 20 470 ÷ 8 ≈ 60 178 ÷ 6 ≈ 30
÷9 ≈9 360 ÷ 5 ≈ 70 410 ÷ 7 ≈ 60
同学们要在公园种树270 棵，如果每个同学种4棵， 大约需要多少个同学去 种树？
思考：160人去春游，每辆车坐33人，6辆 车够吗？你会用不同的方法解答吗？
1. 平均每筐大约装多少个?
260 个
可以把 260 看作 240。
也可以把 260 看作 280。
240 ÷ 4 = 60(个)280 ÷ 4 = 70(个)
小学数学三年级下册《4、除法估算》课时练 附加答案
1.估算：78÷4≈ 470÷8≈ 178÷6≈83÷9≈ 360÷5≈ 410÷7≈71÷8≈ 181÷2≈ 359÷6≈440÷9≈ 138÷7≈ 323÷4≈125÷2≈ 378÷5≈ 435÷7≈ 187÷6≈297÷4≈ 469÷8≈ 194÷6≈ 823÷9≈183÷6≈ 327÷8≈ 319÷4≈ 639÷8≈2.列竖式计算：（先观察商是几位数）63÷3 55÷5 48÷4 91÷7257÷5 804÷6 604÷2 570÷3答案：1、20 60 30 9 70 609 90 60 50 20 8060 80 60 30 70 6030 90 30 40 80 702、21 11 12 13 51……2 134 302 1901. 和同学相互说一说，如何验算有余数除法？2. 先计算，再验算。
235÷5 187÷3 308÷7 400÷9129÷6 130÷4 128÷8 207÷53. 把这些小兔每5只放在一个兔笼里，需要多少个兔笼？如果每6只放在一个兔笼里呢？120只小兔4. 学校买来115米绳子，截成每2米一段做跳绳。
一共可以做多少根跳绳？5. 学校育了318棵花苗，长大后全部栽在花盆里。
如果每个花盆里栽4棵，一共需要多少个花盆？参考答案1. 略2. 47 62......1 44 44......4 21......3 32 (2)16 41 (2)3. 120÷5=24 120÷6=204. 115÷2=57 (1)5. 318÷4=79 (2)四则运算1.加法、减法、乘法和除法统称四则运算。
三年级下册除法估算
比80元呢？
因为80×3=240(元)，240元＜267元，所以 每天的住宿费比80多。
方法归纳 除数是一位数的除法估算，一般 是把被除数看成整百、整十或几百几 十的数，除数不变，用口算除法的基 本方法进行计算。
练习
1.估算43÷4时，我们可以把43看作 （ 40 ）来算，大约得（ 10 ）。
2.估算208÷7时，我们可以把208看
除数是一位数的除法
除法估算（例8）
阳西县方正小学
黎美英
绿色圃中小学教育网
复习
1.口算： 240÷8= 30 450÷9= 50
120÷3= 40
60÷6= 10
320÷4= 80
630÷7 = 90
160÷4 = 40
360÷6 = 60
280÷4 = 70
探究新知
我知道了：住了3天，住宿费一共是267元。 要解决： 每天的住宿费大约是多少钱？
大概、差不多 “大约”是什么意思？ 求大约多少钱用不用算出准确的钱数？ 不用
每天的住宿费=总钱数÷住的天数
267 ÷
3 ≈
பைடு நூலகம்67 ÷
第一种： 267÷3≈ 100
3
≈
第二种： 267÷3≈ 90
可以把267看作270
作（210 ）来算，大约得（ 30 ）。
练习 78 ÷ 4 ≈ （ 20 ） 估算 361 ÷ 5 ≈ （ 70 ）
178 ÷ 6 ≈（ 30 ）
98 ÷ 9 ≈ （ 10 ） 470÷ 8 ≈ （ 60 ） 500 ÷ 7 ≈ （ 70 ）
下面的计算对吗？
912÷3 ≈ 61 189÷4 ≈ 200 124÷3 ≈ 40
练习
1. 平均每筐大约装多少个?
三年级数学下册除法估算练习题 (2)
三年级数学下册除法估算练习题653÷7≈916÷3≈870÷4≈716÷5≈180÷6≈780÷3≈805÷2≈248÷8≈246÷7≈320÷5≈103÷3≈213÷3≈174÷9≈ 197÷3≈352÷5≈296÷4≈160÷5≈220÷9≈153÷5≈ 357÷6≈164÷2≈ 148÷8≈ 446÷8≈ 911÷9≈405÷7≈ 176÷8≈ 325÷4≈ 155÷4≈218÷6≈ 350÷8≈ 801÷6≈ 220÷9≈218÷4≈ 354÷5≈ 602÷8≈ 251÷3≈估算二510÷6≈ 377÷6≈ 192÷7≈ 330÷4≈175÷5≈ 225÷3≈ 415÷5≈ 474÷5≈740÷8≈ 500÷6≈ 200÷7≈ 121÷4≈375÷5≈ 292÷3≈ 638÷8≈ 227÷3≈441÷5≈ 212÷7≈ 604÷4≈260÷4≈375÷9≈ 600÷8≈ 468÷5≈ 357÷6≈246÷3≈ 194÷8≈ 516÷6≈ 500÷8≈432÷8≈ 125÷5≈150÷4≈453÷6≈205÷3≈ 521÷7≈440÷5≈ 870÷9≈估算三352÷5≈ 429÷8≈ 524÷8≈ 594÷7≈197÷3≈ 287÷4≈220÷3≈ 512÷8≈103÷3≈ 444÷6≈210÷4≈ 645÷8≈566÷7≈ 728÷8≈ 370÷7≈ 520÷6≈519÷6≈ 388÷4≈ 706÷9≈ 254÷3≈728÷8≈ 83÷5≈190÷6≈ 396÷4≈308÷7≈ 427÷5≈ 598÷8≈ 569÷6≈190÷2≈ 432÷8≈ 368÷5≈ 451÷9≈估算四315÷7≈ 245÷3≈726÷9≈ 554÷8≈500÷6≈ 298÷7≈ 267÷7≈ 716÷9≈521÷5≈ 232÷4≈ 285÷6≈ 267÷3≈167÷3≈ 434÷8≈375÷8≈ 567÷9≈369÷4≈ 498÷7≈ 197÷3≈ 874÷9≈483÷8≈ 320÷8≈ 408÷9≈ 490÷6≈248÷8≈ 368÷5≈ 508÷6≈ 380÷6≈592÷9≈ 796÷9≈ 148÷4≈ 500÷9≈脱式计算（390+30）÷7 2340÷5÷3 2065+4675÷5396÷3÷2 25×8÷4 985-168÷4648+480÷3 124-735÷7 （34＋22）÷845÷（15÷3）（601－246）÷5 205＋7×862-（25-7） 32×4＋72 305×3-154523+248-475 470÷5-28 459÷9÷7294＋399÷7 78÷3÷5684+207÷3 140÷5÷2＝64＋396÷3＝56×8÷7 366÷（54÷9）用竖式计算并验算348÷3= 398÷7= 365÷5= 380÷6=724÷4= 628÷3= 912÷3= 735÷9=309÷3= 750÷5= 608÷3= 860÷2=270÷6= 105÷7= 208÷8= 204÷2=结束语2、同学们.科学的殿堂美不胜收.只要大家以勤为径.每个人都能领略到无限美好的风光。
完整)三年级数学下册除法估算练习题
完整)三年级数学下册除法估算练习题XXX 1:653 divided by 7 is approximately 93.916 divided by 3 is approximately 305.870 divided by 4 is approximately 218.716 divided by 5 is approximately 143.180 divided by 6 is approximately 30.780 divided by 3 is approximately 260.805 divided by 2 is approximately 402.248 divided by 8 is approximately 31.246 divided by 7 is approximately 35.174 divided by 9 is approximately 19.160 divided by 5 is approximately 32.164 divided by 2 XXX divided by 7 is approximately 58.218 divided by 6 is approximately 36.218 divided by 4 XXX divided by 5 is approximately 64.97 divided by 3 is approximately 32.220 divided by 9 XXX 148 divided by 8 is approximately 19.76 divided by 8 is approximately 10.350 divided by 8 XXX divided by 5 XXX divided by 3 is approximately34.352 divided by 5 is approximately 70.153 divided by 5 is approximately 31.446 divided by 8 is approximately 56.325 divided by 4 is approximately 81.801 divided by 6 is approximately 134.602 divided by 8 is approximately 75.213divided by 3 XXX divided by 4 is approximately 74.357 divided by 6 is approximately 60.911 divided by 9 XXX divided by 4 is approximately 39.220 divided by 9 is approximately 24.251 divided by 3 is approximately 84.XXX 2:510 divided by 6 is approximately 85.377 divided by 6 is approximately 63.192 divided by 7 is approximately 27.330 divided by 4 XXX divided by 5 is approximately 35.225 divided by 3 is approximately 75.415 divided by 5 is approximately 83.474 divided by 5 is approximately 95.740 divided by 8 is approximately 92.375 divided by 5 is approximately 75.441 divided by 5 is approximately 88.375 divided by 9 is approximately 42.246 divided by 3 XXX divided by 8 is approximately 54.205 divided by 3 is approximately 68.500 divided by 6 is approximately 83.292 divided by 3 is approximately 97.212 divided by 7 is approximately 30.600 divided by 8 is approximately 75.194 divided by 8 XXX divided by 5 is approximately 25.521 divided by 7 XXX divided by 7 is approximately 29.638 divided by 8 is approximately 80.604divided by 4 is approximately 151.468 divided by 5 is approximately 94.516 divided by 6 is approximately 86.150 divided by 4 XXX divided by 5 is approximately 88.121 divided by 4 is approximately 30.227 divided by 3 XXX divided by 4 XXX divided by 6 is approximately 60.500 divided by 8 XXX divided by 6 XXX divided by 9 is approximately 97.XXX 3:352 divided by 5 is approximately 70.429 divided by 8 XXX divided by 8 XXX divided by 7 is approximately 85.197 divided by 3 is approximately 66.287 divided by 4 is approximately 72.220 divided by 3 is approximately 73.512 divided by 8 XXX divided by 3 is approximately 34.566 divided by 7 is approximately 81.519 divided by 6 is approximately 87.728 divided by 8 is approximately 91.308 divided by 7 XXX 190 divided by 2 is approximately 95.804 divided by 9 is approximately 89.444 divided by 6 XXX divided by 8 is approximately 91.388 divided by 4 XXX divided by 5 is approximately 17.427 divided by 5 is approximately 85.432 divided by 8 XXX divided by 9 is approximately 60.210 divided by 4 is approximately 53.370divided by 7 is approximately 53.706 divided by 9 XXX 190 divided by 6 is approximately 32.598 divided by 8 is approximately 75.368 divided by 5 XXX divided by 8 is approximately 70.645 divided by 8 is approximately 81.520 divided by 6 is approximately 87.254 divided by 3 is approximately 85.396 divided by 4 is approximately 99.569 divided by 6 is approximately 95.451 divided by 9 is approximately 50.473 divided by 5 is approximately 95.XXX 4:315 divided by 7 XXX divided by 3 XXX divided by 9 is approximately 81.554 divided by 8 XXX divided by 6 is approximately 83.298 divided by 7 is approximately 42.267 divided by 7 is approximately 38.716 divided by 9 is approximately 80.521 divided by 5 is approximately 104.167 divided by 3 is approximately 56.369 divided by 4 is approximately 92.483 divided by 8 is approximately 60.248 divided by 8 is approximately 31.592 divided by 9 XXX divided by 9 is approximately 27.232 divided by 4 is approximately 58.434 divided by 8 XXX divided by 7 XXX divided by 8 isapproximately 40.368 divided by 5 is approximately 74.796 divided by 9 is approximately 88.460 divided by 5 is approximately 92.285 divided by 6 is approximately 48.375 divided by 8 is approximately 47.197 divided by 3 is approximately 66.408 divided by 9 is approximately 45.508 divided by 6 is approximately 85.148 divided by 4 is approximately 37.347 divided by 5 is approximately 69.267 divided by 3 is approximately 89.567 divided by 9 XXX divided by 9 XXX 490 divided by 6 XXX divided by 6 XXX divided by 9 is approximately 56.352 divided by 4 is approximately 88.脱式计算：390+30)÷÷5÷+4675÷5396÷3÷2 = 5.5648+480÷3 = 84845÷(15÷3) = 925×8÷4 = 50124-735÷7 = 23601－246÷5 = 153985-168÷4 = 94734+22)÷8 = 6205+7×8 = 26162-(25-7)×32+×3-+248-475 = 219,164 294+399÷7 = 35464+396÷3 = 232470÷5-÷9÷7 = 46278÷3÷5684+207÷3140÷5÷2 = 0.0156×8÷XXX÷(54÷9) = 0.67用竖式计算并验算：348÷3=116，398÷7=57，365÷5=73，380÷6=63，724÷4=181309÷3=103，270÷6=45，628÷3=209，750÷5=150，105÷7=15912÷3=304，608÷3=203，208÷8=26735÷9=81，860÷2=430。