（北师大版）小学数学三年级上册每课一练难题集.docx

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（北师大版）小学三年级数学上册每课一练难题集

1、（ &nbsp; &nbsp; ）×3＝210 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;4×（ &nbsp; &nbsp; ）=200 &nbsp; &nbsp;
（ &nbsp; ）×3=180 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 6×（ &nbsp; ）=30×（ &nbsp; &nbsp;）
&nbsp; &nbsp;
2、（ &nbsp; &nbsp;）×80=6×（ &nbsp; &nbsp; ）=24×10=12×20 &nbsp;

3、在下列每组三个5之间填上适当的运算符号和括号，使等式成立。
&nbsp; 5 &nbsp; 5 &nbsp; 5 &nbsp;=5 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 5 &nbsp; 5 &nbsp; &nbsp; 5 &nbsp;=20
&nbsp; 5 &nbsp; 5 &nbsp; 5 &nbsp;=6 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 5 &nbsp; 5 &nbsp; 5 &nbsp;=2
4、找规律接着往下填。
&nbsp; （1）5 &nbsp; 10 &nbsp; &nbsp;20 &nbsp; &nbsp;40 &nbsp; &nbsp;（ &nbsp; &nbsp;） &nbsp; （ &nbsp; &nbsp; ）
&nbsp; （2）1 &nbsp; 3 &nbsp; &nbsp; 9 &nbsp; &nbsp; 27 &nbsp; &nbsp;（ &nbsp; &nbsp;） &nbsp; （ &nbsp; &nbsp; ）
&nbsp; （3）2 &nbsp; 6 &nbsp; &nbsp; 18 &nbsp; 54 &nbsp; &nbsp; （ &nbsp; ） &nbsp; &nbsp;（ &nbsp; &nbsp; ）
&nbsp; （4）64 &nbsp;32 &nbsp; &nbsp;16 &nbsp; 8 &nbsp; &nbsp; &nbsp;（ &nbsp; &nbsp;） &nbsp; （ &nbsp; &nbsp; ）
5、有一个旅游团共50人，他们怎样租车最合算？
限乘20人，每辆租金35元
限乘15人，每辆租金30元

面包车 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 中巴车

6、一本书共220页，大华已经看了120页，剩下的在5天内看完。这5天里大华平均每天看多少页？

7、○×□=45， &nbsp; ○－□=12， ○=（ &nbsp;）□=（ &nbsp;）
&nbsp;○÷□=7， &nbsp; &nbsp;○+□=48， &nbsp;○=（ &nbsp;）□=（ &nbsp;）
8、○、□、△、☆后面分别藏着什么？
&nbsp;440－□×2=400 &nbsp;□=（ &nbsp; ） &nbsp; &nbsp;210+○×4=330 &nbsp;○=（ &nbsp; ）
60÷△+5=15 &nbsp; &nbsp; △=（ &nbsp; &nbsp;） &nbsp; &nbsp;☆×4+12=48 &nbsp; &nbsp;☆=（ &nbsp; &nbsp; ）
9、250-□×4=42 &nbsp; &nbsp; &nbsp; □=（ &nbsp; ） &nbsp;
（□－58）×8=16 &nbsp; &nbsp;□=（ &nbsp; ）
（23+□）×3=96 &nbsp; &nbsp; □=（ &nbsp; ）
7×（□－12）=63 &nbsp; &nbsp; □=（ &nbsp; ）
10、王叔叔把一根木头锯成4段用了12分。照这样计算，把这根木头锯成6段需要多少分？

11、用同样大小的正方体搭出从上面、侧面看到的都是 &nbsp; &nbsp; &nbsp;形状的立体图形，你有几种不同的摆法？

12、数一数，图中有（ &nbsp;）个小正方体。

13、2008年12月23日，熊猫“团团”和“圆圆”运送至我国宝岛台湾。当时团团体重114（ ），圆圆体重112（ ）。它们主要以吃竹子为主；每天食用窝窝头2200（ ），胡萝卜400（ ），苹果2个。
14、从1，2，3，4中选出两个不同的数字组成一个两位数，共可组成（）个不同的两位数。
15、在□里填上合适的数
&nbsp; 2 □ &nbsp; &nbsp; &nbsp; &nbsp;□□ &nbsp; &nbsp; &nbsp; 1 &nbsp;3 □ &nbsp; &nbsp; &nbsp;1□□ &nbsp;
× &nbsp; &nbsp;2 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;× &nbsp; &nbsp;2 &nbsp; &nbsp; &nbsp; &nbsp; × &nbsp; &nbsp; &nbsp;3 &nbsp; &nbsp; &nbsp; × &nbsp; &nbsp; □
&nbsp; 4 &nbsp;6 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 4 &nbsp; 8 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;3 &nbsp;9 &nbsp;6 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;4 &nbsp;8 &nbsp;4

16、在□里填上合适的数
&nbsp;1 3 □ &nbsp; &nbsp; &nbsp; &nbsp;□□ &nbsp; &nbsp; &nbsp; 1 &nbsp;3 □ &nbsp; &nbsp; &nbsp;1□□ &nbsp;
× &nbsp; &nbsp;3 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;× &nbsp; &nbsp;2 &nbsp; &nbsp; &nbsp; &nbsp; × &nbsp; &nbsp; &nbsp;3 &nbsp; &nbsp; &nbsp; × &nbsp; &nbsp; □
&nbsp; 4 &nbsp;6 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 4 &nbsp; 8 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;3 &nbsp;9 &nbsp;6 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;4 &nbsp;8 &nbsp;4

&nbsp; &nbsp; &nbsp; &nbsp;7
× &nbsp; &nbsp;
5 &nbsp;8 &nbsp;2 &nbsp;3
1 &nbsp;3
× &nbsp; &nbsp; 3
&nbsp; &nbsp; &nbsp; 2

&nbsp;
2 &nbsp;3
× &nbsp; &nbsp;4
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 4 &nbsp; &nbsp; &nbsp; &nbsp;
17、找规律填数
&nbsp; &nbsp;69 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;70 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 64
3 &nbsp; &nbsp;23 &nbsp; &nbsp; &nbsp; &nbsp;14 &nbsp; 5 &nbsp; &nbsp; &nbsp;26 &nbsp; 3 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 4 &nbsp; &nbsp; &nbsp;

成人票：19元/张
儿童票：9元/张
18、光明小学2位老师带54名学生去动物园游玩，用500元钱买门票够吗？

19、在□里填上合适的数

&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 3 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;8 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;3 &nbsp; &nbsp; 7
&nbsp; &nbsp; × &nbsp; &nbsp; &nbsp; 3 &nbsp; &nbsp; &nbsp; × &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;×
&nbsp; &nbsp; &nbsp; 6 &nbsp; &nbsp; &nbsp;6 &nbsp; &nbsp; &nbsp; &nbsp;7 0 &nbsp; &nbsp; &nbsp;5 &nbsp; &nbsp; &nbsp; &nbsp;2 &nbsp; &nbsp; 9 &nbsp; &nbsp;
20、淘气和笑笑同时从学校走到电影院要用8分，全班52名同学同时从学校走到电影院要用多少分？

21、在□里填上合适的数
&nbsp; &nbsp; &nbsp; 7 &nbsp; &nbsp; &nbsp;3 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 7
&nbsp; × &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;×
&nbsp; &nbsp; &nbsp; 7 &nbsp; &nbsp; &nbsp;8 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 2 &nbsp;9 &nbsp; &nbsp; &nbsp;3 &nbsp;
22、计算下列各题，你能发现什么规律？请根据规律继续往下写3题。
&nbsp;1×8＋1= &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;9×9－1=
&nbsp;12×8＋2= &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 98×9－2=
123×8＋3= &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;987×9－3=

23、观察下列各题，你能发现什么规律？请根据规律继续往下写3题。
&nbsp;21×9＝189 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 9×9＋7=88
321×9＝2889 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 98×9＋6=888
4321×9＝38889 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 987×9＋5=8888

24、哥哥和弟弟两人共有课外书90本，如果哥哥给弟弟5本，两人拥有的书就同样多了。原来哥哥和弟弟各有多少本课外书？

25、小明去外婆家，如果来回都坐大客车要用30分（大客车来回的速度相同）。有一次小明去时乘坐大客车，回来时骑自行车，共用了48分。小明去外婆家骑自行车要用多少时间？

26、在□里填上合适的数
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;9 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 4
&nbsp; &nbsp;× &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; × &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 6 &nbsp; &nbsp; &nbsp; × &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;7
&nbsp; &nbsp; 1 &nbsp;9 &nbsp; &nbsp; &nbsp;1 &nbsp; &nbsp; &nbsp;1 &nbsp; &nbsp; &nbsp; &nbsp; 0 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;1 &nbsp; &nbsp; &nbsp; &nbsp;0
27、用2，3，8三个数字可以组成多少个不同的三位数？请一一列举出来。

28、哥哥今年12岁，弟弟今年8岁。当两人的年龄和是30岁时，两人各是几岁？

29、右图是希望小学教学楼的平面设计图，请你算一算它的周长。
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;65m
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;32m &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 10m &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;

30、测量下面图形的周长。
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;

&nbsp; &nbsp; &nbsp;约（ &nbsp; &nbsp;）厘米 &nbsp; &nbsp; 约（ &nbsp; &nbsp;）厘米 &nbsp; &nbsp; &nbsp; 约（ &nbsp; &nbsp;）厘米 &nbsp;
31、一张长方形的床，它的宽是160厘米，长比宽多50厘米。这张床床面的周长是多少厘米？

要给这个正方形相框镶一圈花边，至少需要多长的花边？
32、用用数学
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;

&nbsp; &nbsp; &nbsp; &nbsp; 28cm
&nbsp; &nbsp; &nbsp; &nbsp;

33、用一根绳子可以围成右面的长方形。如果用这根绳子围成一个正方形，它的边长是多少？ &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 9cm
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;7cm

34、王奶奶在围墙边用篱笆围成了一块长方形菜地（如图），求篱笆周长。
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 15m
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;20m
35、如图，将一张长9dm、宽6dm的长方形纸板沿虚线剪成一个长方形和一个正方形，周长增加了多少？
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;6dm
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 9dm
36、下列4个图形都是由6个边长为1cm的小正方形拼成的。你知道它们的周长分别是多少吗？
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;

&nbsp;
（ &nbsp;）cm &nbsp; &nbsp; &nbsp;（ &nbsp;）cm &nbsp; &nbsp; &nbsp; （ &nbsp;）cm &nbsp; &nbsp; &nbsp; &nbsp;（ &nbsp;）cm
37、实验小学三年级同学去秋游，共有250人参加，每人的乘车费用为4元钱。
&nbsp;（1）一共需要多少钱？

&nbsp;（2）因为乘车的人数较多，公交公司将每人的车费便宜了6角，总共便宜了多少元？现在只需支付多少元车费？

38、如图，妈妈给盒子系上丝带，至少需要多长的丝带？（接头处长度不计） &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 5cm &nbsp; 16cm
&nbsp;

39、在空格中填上合适的数字，使等式成立。
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;3
× &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;7

&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;3
×
&nbsp; &nbsp; &nbsp; &nbsp;3 &nbsp;6 &nbsp;7
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;

40、甲仓存粮90吨，乙仓存粮30吨。甲仓要运多少吨粮食到乙仓，才能使甲仓存粮的吨数是乙仓的2倍？

41、两个完全一样的长方形摆放如图所示。求两个图形合在一起后图形的周长？ &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;12cm &nbsp; &nbsp; &nbsp; &nbsp; 4cm

42、国庆节，广场上的小旗按照1蓝2黄3红的顺序循环排列。请问第87面小旗是什么颜色？第156面呢？

43、一根电线长57米，每3米剪成一段，一共需要剪几次？

44、把2，5，0，9填在适当的方格内。
（1）商最大 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;（2）商最小

精品资料
45、要使4 &nbsp; 8÷4的商中间有0， &nbsp;里可以填（ &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;）；
&nbsp; &nbsp;要使商中间没有0， &nbsp; 里可以填（ &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ）。
46、在 &nbsp; 里填上适当的数，使得数最接近800.
&nbsp; &nbsp; 392× &nbsp; &nbsp; &nbsp; 204× &nbsp; &nbsp; &nbsp;193× &nbsp; &nbsp; &nbsp; &nbsp;261× &nbsp; &nbsp; &nbsp; &nbsp;161× &nbsp; &nbsp;
47、在一个数的后面添上一个0，得到的新数比原来的当选大909。原来这个数是多少？

48、756÷ &nbsp;，要使商是三位数， &nbsp;里可以填（ &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;）
&nbsp; &nbsp;要使商是二位数， &nbsp;里可以填（ &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;）。
49、 &nbsp;43÷5，要使商是三位数， &nbsp;里最小可以填（ &nbsp;）。
50、a÷8与35÷ &nbsp; 的商相等，a最大是（ &nbsp; ）。
51、工人叔叔在一条长428米的公路一边安装路灯（两端都不装），每隔4米装一盏，共要装多少盏路灯？

52、4个工人5天生产零件200个，照这样计算，6个工人9天生产多少个零件？

53、一个两位数乘5后得数在400和430之间。这个两位数可能是多少 ？
54、被除数与除数的和是320，商是7，被除数和除数各是多少？

55、三年级分3个组去敬老院打扫卫生。第一、二组共有38人，第二、三组共有42人，第一、三组共有40人。三个组共有多少人？

56、
&nbsp; &nbsp; &nbsp;
&nbsp; &nbsp; &nbsp;
已知： &nbsp; &nbsp; =240克
那么： &nbsp; &nbsp;=（ &nbsp;）克 &nbsp; &nbsp; &nbsp; &nbsp; =（ &nbsp;）克 &nbsp; &nbsp; &nbsp; =（ &nbsp; ）克
57、一个数除以5，所得的商与余数相同，这样的数有几个？请列举出来 。

58、某个月有4个星期六，5个星期日，这个月的2号是星期（ &nbsp;） 。
59、某年的3月份植树节是星期六，利用日历推算出这个月的最后一天是星期几。

60、学校操场长100米。开学时，操场上5米插一面旗，3米摆一盆花，同时插旗、摆花的地方有（ &nbsp;）处。
旗
5

花
3

61、朝阳车站从早上6时起同时发1路车和2路车，1路车发车时间为4分一辆，2路车发车时间为5分一辆。第二次同时发车的时间是（ &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;）。

62、甲、乙、丙3人各提一只水桶到同一个自来水龙头前排队打水，每人装满各自的水桶所需的时间分别为：甲3分，乙8分，丙6分。问：如何安排顺序，才能使三个人装满各自的一桶水所用的总时间（包括各自等待的时间）最少？

63、有一年的2月份有5个星期日，那么这一年的6月1日是星期几？

64、有红、白、黄三种颜色的球各若干个放在同一个不透明的袋中，至少摸出几个球才能保证摸出两个同种颜色的球？

65、学校举行数学竞赛，参加决赛的是甲、乙、丙、丁、戊5位同学，另外A、B、C、D、E 5位同学猜测决赛名次。他们的说法如下：A：“乙第三，丙第五”。 &nbsp;B：“戊第四，丁第五”。 &nbsp;C：“甲第一，戊第四”。 D：“丙第一，乙第二”。 &nbsp;E：“甲第三，丁第四”。成绩出来后，知道每个人的名次都有人猜中，请你排出甲、乙、丙、丁、戊的决赛名次。

66、在一个整数除法算式里，两数相除的商是9，余数是12，被除数可取的最小数是多少？

67、三（1）班共有42名学生，其中男生比女生多2人。三（1）班男、女生各有多少人？

68、如果 &nbsp;表示亮灯， &nbsp;表示不亮灯。上、下两行灯照下面的规律一直排下去。
&nbsp; 上行： &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
下行： &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
第（ &nbsp;）盏灯时，上、下两盏灯同时亮。如果上、下两行各放90盏灯，上、下两盏灯同时亮的机会有（ &nbsp;）次。
69、小方用5张边长为2厘米的正方形卡片，拼成如图的形状 &nbsp; &nbsp; &nbsp;
&nbsp;请你帮他算算，这个图形的周长是多少？

70、学校买来4个足球和个排球，共用去170元钱。已知每个足球比每个排球贵5元。每个排球多少元？

71、2009年五一国际劳动节是星期五。请你算一算，2009年国庆节是星期几？

72、从一张长20cm、宽15cm的长方形纸上，先剪下一个最大的正方形，再从余下的纸片中继续剪下一个最大的正方形，剩下一个长方形，它的周长是多少？

73、长方形的长是16厘米，宽是8厘米，用两个这样的长方形拼成1个正方形，正方形遥周长是多少？把两个这样的长方形拼成一个大长方形，大长方形的周长是多少？

74、小红今年13岁，爷爷今年73岁。几年后爷爷的年龄刚好是小红的5倍？

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