1、12016-2017 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)0.372.4= 1.0625= 0.8425=0.274.3 (得数保留两位小数) 0.086.02 (得数保留三位小数)246.413 (得数保留两位小数) 19.412 (得数保留两位小数)9.4080.12= 32816 = 验算: 验算:2二、把下列的假分数化成带分数或整数(每小题 0.5 分,共 3 分) 。= = = 5374225= = = 8175647三、把下列带分数化成假分数(每小题 0.5 分,共 3 分) 。2 =
2、 3 = 5 = 546514 = 10 = 3 = 81324四、 用递等式计算下面各题。(24 分)(184+296)147 97(765-665) 25 4.5+7.290.53.6+6.43.2 29.67.42.4 8.7(5.44-3.5)0.4 ( ) 8712564310813243 ( )5432617541354312五、用简便方法计算下面各题。 (24 分)3.9+3.999 253.2125 0.62837+6.286.38.75-(6.25-0.38) 2.510.1 10.28-(6.28+3.52) 951347137851243 ( ) 951274915851
3、324六、 解方程。 (36 分)8x-3x=105 4x-39=29 2(x-2.6)=8 (x-3) 2=7.5 x+2.4x=5.1 3(x+2.1)=10.5 2x = x = x0.7x4=13541538740x5x=7 14.52x=6.5 12x4x0.6=4.2 2.7x1.6=38.9 x( )= x=1 14372435x = x = 3x1.25=95420319357五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。
4、)0.372.4= 0.888 1.0625= 26.5 0.8425=210.274.31.16 (保留两位小数) 0.086.020.412(保留三位小数)246.41318.95(保留两位小数)19.4121.62 (保留两位小数)9.4080.12=78.4 32816=20.5 验算:78.40.12 =9.408 验算:20.516 =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) 。= 7 = 6 = 8 52423251=2 =9 = 7 81564三、把下列带分数化成假分数(每小题 0.5 分,共 3 分) 。62 = 3 = 5 = 541652
5、1264 = 10 = 3 = 8334四、 用递等式计算下面各题。(24 分,每小题 2 分,要按步给分。)(184+296)147 97(765-665) 25 4.5+7.290.5=480147 =9710025 =4.5+0.80.5=67207 =970025 =4.5+0.4=960 =388 =4.93.6+6.43.2 29.67.42.4 (7.5+2.54)0.8=3.6+2 =42.4 =(7.5+10) 0.8=5.6 =9.6 =17.50.8=21.875 ( ) 8712564310281324= = = ( )4056= = = 125= = = 231201
6、430= =7 ( )5432617541354312= = = ( )02806= = = 1 1= = = 30451523= = =9439= = 1五、 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+3.999 253.2125 0.62837+6.286.3=3.9(1+99) =2540.8125 =6.283.7+6.286.3=3.9100 =(254) (0.8125) =6.28(3.7+6.3)=390 =100100 =6.2810=10000 =62.88.75-(6.25-0.38) 2.51
7、0.1 10.28-(6.28+3.52)=8.75-6.25+0.38 =2.5(10+0.1) =10.28-6.28-3.52=2.5+0.38 =2.510+2.50.1 =4-3.52=2.88 =25.25 =0.48 951347137851243=( )( ) = ( ) =( )8( )43=1-1 = 1 =1037=0 = =14 ( ) 95127491585132= = = =1 =1 = 3=1 = =2127542=1 1六、 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-39=29 2(x-2.6)=8 解
8、:(8-3)x=105 解: 4x-27=29 解:2(x-2.6) 2=825x=105 4x-27+27=29+27 x-2.6=45x5=1055 4x=56 x-2.6+2.6=4+2.6x=21 4x4=564 x=6.6x=14(x-3) 2=7.5 x+2.4x=5.1 3(x+2.1)=10.5 解:(x-3) 22=7.52 解:3.4x=5.1 解:3(x+2.1) 3=10.53x-3=15 3.4x3.4=5.13.4 x+2.1=3.5x-3+3=15+3 x=1.5 x+2.1-2.1=3.5-2.1x=18 x=1.492x = x = x0.7x4=135415
9、387解:2x = 解:x = 解:x-0.7x+4-4=13-42x=1 x= 0.3x0.3=90.34022x2=12 x= x=301x= 140x5x=7 6.52x=14.5 12x4x0.6=4.2 解: 35x=7 解:6.5+2x-6.5=14.5-6.5 解: 16x-0.6=4.235x35=735 2x=8 16x-0.6+0.6=4.2+0.6x= 2x2=82 16x=4.8357x= x=4 16x16=4.8161x=0.32.7x1.6=38.9 x( )= x=1 1437243解:2.7x-1.6+1.6=38.9+1.6 解:x( )= 解: x =182.7x=40.5 x = x=1412.7x2.7=40.52.7 x= 7x=15 x= 8x= 79x = x = 3x1.25=9542031935解:x = 解:x = 解: 3x-6=9810x= x = 3x-6+6=9+620316931893x= x= 3x=15953x3=153x=5