2011-2012第二学期五年级计算竞赛试卷
(比赛时间40分钟,满分100分。)
学校: 班级: 姓名: 得分:
一、列竖式计算。(10分)
0.37×2.4= 1.06×25=
0.27×4.3 (得数保留两位小数) 0.08×6.02
246.4÷13 (得数保留两位小数) 19.4÷12
9.408÷0.12= 328÷16 =
验算:
1
0.84×25= (得数保留三位小数) (得数保留两位小数) 验算:
二、把下列的假分数化成带分数或整数(每小题0.5分,共3分)。
372425= = = 543
454717
= = =
568
三、把下列带分数化成假分数(每小题0.5分,共3分)。
451
2= 3= 5= 565
4
121
= 10= 3= 834
四、 用递等式计算下面各题。(24分)
(184+296)×14÷7 97×(765-665) ÷25 4.5+7.2÷9×0.5
3.6+6.4÷3.2 29.6÷7.4×2.4 8.7÷(5.44-3.5)÷0.4 [1**********]-+ +- -(-) [1**********]4
2
421513412-+ +- -(-) 5367414
五、用简便方法计算下面各题。(24分)
3.9+3.9×99 25×3.2×125 0.628
8.75-(6.25-0.38) 2.5×10.1 10.28- 59-311+49-711 1713-38-58
59+712+49 1189-5+9
3
5315
×37+6.28×6.3 (6.28+3.52) 1112-34+112+34 135-(233+5)
六、 解方程。(36分)
8x-3x=105 4x-3×9=29 2(x-2.6)=8
(x-3) ÷2=7.5 x+2.4x=5.1 3(x+2.1)=10.5
2x-45=15
40x-5x=7
2.7x-1.6=38.9 x-
45=320
x+35=7
8 14.5+2x=6.5 x-(
314+47)=12 x+319 =1519-7
19
4
x-0.7x+4=13
12x+4x-0.6=4.2 3
4
+x=1 3x-1.2×5=9
五年级数学计算题知识竞赛评分标准
一、列竖式计算。(10分,前面7小题,每小题各1分,后面两小题各1.5分,其中验算占0.5分,如计算正确但保留小数错误或没有用“≈”号要扣0.5分。)
0.37×2.4= 0.888 1.06×25= 26.5 0.84×25=21
0.27×4.3≈1.16 (保留两位小数) 0.08×6.02≈0.412(保留三位小数) 246.4÷13≈18.95(保留两位小数)19.4÷12≈1.62 (保留两位小数) 9.408÷0.12=78.4 328÷16=20.5 验算:78.4×0.12 =9.408 验算:20.5×16 =328
二、把下列的假分数化成带分数或整数(每小题0.5分,共3分)。
37224251
= 7 = 6 = 8 55433
14547517
=2 =9 = 7 85668
三、把下列带分数化成假分数(每小题0.5分,共3分)。
2
121133332 4= 10= 3=
834483
5
414526231= 3= 5=
555656
四、 用递等式计算下面各题。(24分,每小题2分,要按
步给分。)
(184+296)×14÷7 97×(765-665) ÷25 4.5+7.2÷9×0.5 =480×14÷7 =6720÷7 =960
3.6+6.4÷3.2 29.6=3.6+2 =5.6 78-512+56 =2124-102024+24 =1124+2024 =3124
45-23+16 =1215-1015+16 =2115+6 =430+5
30
=9
30
=310
=97×100÷25 =9700÷25 =388 ÷7.4×2.4 =4×2.4 =9.6 34+310-1120 =1561120+20-20 =2120-1120 =1020 =12 57+14-314 =20728+28-628 =2728-628 =2128 =34 6
=4.5+0.8×0.5 =4.5+0.4 =4.9 (7.5+2.5×4)÷0.8 =(7.5+10) ÷0.8 =17.5÷0.8 =21.875 11218-(3-4) =118-(8312-12) =1158-12 =3324-1024
=23
24
4125-(3-15) =455-(15-215
)
=435-15
=12315-15
=915
=35
五、 用简便方法计算下面各题。(24分,每小题2分,要按步
给分。如计算正确但没有用简算的要扣0.5分。)
3.9+3.9×99 25×3.2×125 0.628×37+6.28×6.3 =3.9×(1+99) =25×4×0.8×125 =6.28×3.7+6.28×6.3 =3.9×100 =(25×4) ×(0.8×125) =6.28×(3.7+6.3) =390
8.75-(6.25-0.38) 2.5=8.75-6.25+0.38 =2.5+0.38 =2.88 59-311+49-711 =(54379+9)-(11+11)=1-1 =0
59+712+49 =59+479+12 =1+712 =1712
=100×100 =10000 ×10.1 10.28-=2.5×(10+0.1) =2.5×10+2.5×0.1 =25.25 1713-38-58 =7313-(8+58) =17
13-1 =4
13
19-15+89 =1819+9-5 =1-15 =45 7
=6.28×10 =62.8 (6.28+3.52) =10.28-6.28-3.52 =4-3.52 =0.48 1112-34+112+34 =(1113312+12)+(4-4
)=1+0
=1
135-(23+35) =135-233-5
=135-35-23
=2-23
=11
3
六、 解方程。(36分,每小题2分,要按步给分。漏写“解”
扣0.5分)
8x-3x=105 4x-3×9=29 2(x-2.6)=8 解:(8-3)x=105 解: 4x-27=29 解:2(x-2.6) ÷2=8÷2
5x=105 4x-27+27=29+27 x-2.6=4 5x÷5=105÷5 4x=56 x-2.6+2.6=4+2.6 x=21 4x÷4=56÷4 x=6.6 x=14
(x-3) ÷2=7.5 x+2.4x=5.1 3(x+2.1)=10.5
解:(x-3) ÷2×2=7.5×2 解:3.4x=5.1 解:3(x+2.1) ÷3=10.5÷3
x-3=15 3.4x÷3.4=5.1÷3.4 x+2.1=3.5 x-3+3=15+3 x=1.5 x+2.1-2.1=3.5-2.1
x=18 x=1.4
4137
2x-= x+= x-0.7x+4=13
5558
33734414
解:2x-+=+ 解:x+-=- 解:x-0.7x+4-4=13-4
55555585
3524
2x=1 x=- 0.3x÷0.3=9÷0.3
404011
2x÷2=1÷2 x= x=30
40
1
x=
2
40x-5x=7 6.5+2x=14.5 12x+4x-0.6=4.2
解: 35x=7 解:6.5+2x-6.5=14.5-6.5 35x÷35=7÷35 2x=8
7
x= 2x÷2=8÷2
351x= x=4 5
解: 16x-0.6=4.2
16x-0.6+0.6=4.2+0.6
16x=4.8
16x÷16=4.8÷16
8
x=0.3
3413
+)= +x=1 [1**********]
解:2.7x-1.6+1.6=38.9+1.6 解:x-(+)= 解:+x-=1-
[**************]1
2.7x=40.5 x-+=+ x=
14142144
711
2.7x÷2.7=40.5÷2.7 x=+
2.7x-1.6=38.9 x-(
x=15
x-
45=320 解:x-45+45=320+45 x=320+1620 x=1920
1414 x=18
14
x=9
7
x+31519 =19-719 解:x+38
19=19
x+338319-19=19-19 x=5
19
9
3x-1.2×5=9 解: 3x-6=9
3x-6+6=9+6 3x=15
3x÷3=15÷3 x=5