小学五年级数学计算能力竞赛试题（含答案）.doc

五年级数学计算能力竞赛试题（时间：60分钟 总分100分）一、口算（每题0.5分，共20分）0.80.5= 1.254= 4.33= 2430=3.7-2.5= 2.20.6= 0.75+0.25= 17100=2.84= 0.150.3= 20-0.2= 2.50.4=5.5+55= 5.60.2= 10.01= 3.50.6= 10.89= 0.95-0.36= 0.134= 844.2=2.26-0.6= 0.63+0.47= 0.870.3= 10012.5=5.24= 0.2540= 1.691.3= 6.5+0.35=1.441.2= 20-14.2= 3.50.4= 2.52.4=9.17= 0.720.6= 2.30.6= 11-1.1=92.54= 4.560.2=1.7+0.3-1.7+0.3= 2.30.22.30.2= 二、计算下面各题。（每题2分，共30分）15.4+5.67 12.33.1-25.9 (16.7-1.4)32.3-1.5+4.54 5.60.8-1.93 18-（0.6+2.45） （0.240.3+5）1.5 (5-0.68)1.2+0.8 （809.8）0.62.21 (12.5-3.62.5)2 18.95（8.43+3.87） 2.8（41-37.4）（0.9+6.2） 1.734.8(4.3+1.7)1.25(12-9.5)0.2 (1.9-1.90.9)(3.8-2.8) 三、用简便方法计算(2，共30分)2.65+8.63+7.35+11.37 8.5-0.26-1.74 1.810.13.34+6.17-1.34+3.83 1.253.22.5 9300.65 0.875101-0.875 23.4-0.8-13.4-7.2 1.258818.740.18+1.260.18 1.92.3+1.92.7-1.9 0.8760+870.5-8.7 0.99990.70.11113.70.9+0.99+0.999+0.9999 959596-969695四、解决下列问题（20分）1. 在填上合适的数字。（每题3分，共6分）2.在内填上适当的数，使等式成立。（3分）73.06(4.465+5.535)+42.06=33.计算下列两题。（每题4分，共8分）10.990.980.970.960.950.940.930.040.030.020.01 （10.120.23）（0.120.230.34）（10.120.230.34）（0.120.23）4.小灵在计算除法时，把除数16错写了19，结果得到的商是17还余13，你能算出它的正确结果吗？（3分） 五年级数学计算能力竞赛试题答案（时间：60分钟 总分100分）一、 口算（每题0.5分，共20分）0.80.5=0.4 1.254=5 4.33=12.9 2430=0.83.7-2.5=1.2 2.20.6=1.32 0.75+0.25=1 17100=0.172.84=11.2 0.150.3=0.5 20-0.2=19.8 2.50.4=15.5+55=60.5 5.60.2=28 10.01=100 3.50.6=2.1 10.89=1.2 0.95-0.36=0.59 0.134=0.52 844.2=202.26-0.6=1.66 0.63+0.47=1.1 0.870.3=2.9 10012.5=85.24=20.8 0.2540=10 1.691.3=1.3 6.5+0.35=6.851.441.2=1.2 20-14.2=5.8 3.50.4=1.4 2.52.4=69.17=1.3 0.720.6=1.2 2.30.6=1.38 11-1.1=9.992.54=0.9 4.560.2=5.41.7+0.3-1.7+0.3=0.6 2.30.22.30.2=0.04 二、计算下面各题。（每题2分，共30分）15.4+5.67 12.33.1-25.9 (16.7-1.4)3=15.4+0.8 =38.13-25.9 =15.33=16.2 =12.23 =5.12.3-1.5+4.54 5.60.8-1.93 18-（0.6+2.45）=0.8+18 =7-5.7 =18-(0.6+12)=18.8 =1.3 =18-12.6 =5.4 （0.240.3+5）1.5 (5-0.68)1.2+0.8 （809.8）0.62.21 =(0.8+5) 1.5 =4.321.2+0.8 =70.20.62.21=5.8 1.5 =3.6+0.8 =42.12-2.21=8.7 =4.4 =39.91 (12.5-3.62.5)2 18.95（8.43+3.87） 2.8=(12.5-9)2 = 18.9512.3 2.8=3.52 =6.652.8=1.75 =18.62（41-37.4）（0.9+6.2） 1.734.8(4.3+1.7)=3.67.1 =1.734.86=25.56 =1.75.8 =9.861.25(12-9.5)0.2 (1.9-1.90.9)(3.8-2.8) =1.252.50.2 = (1.9-1.71)1=1.250.5 = 0.191=2.5 = 0.19三、用简便方法计算(2，共30分)2.65+8.63+7.35+11.37 8.5-0.26-1.74 1.810.1=(2.65+7.35)+(8.63+11.37) =8.5-(0.26+1.74) =1.8(10+0.1)=10+20 =8.5-2 =1.810+1.80.130 =6.5 =18.183.34+6.17-1.34+3.83 1.253.22.5 9300.65=3.34-1.34+(6.17+3.83) =(1.258)(0.42.5) =930(0.65)=2+10 =101 =9303=12 =10 =310 0.875101-0.875 23.4-0.8-13.4-7.2 1.2588=0.875(101-1) =23.4-13.4-(0.8+7.2) =1.25811=0.875100 =10+8 =1011=87.5 =18 =11018.740.18+1.260.18 1.92.3+1.92.7-1.9 =(18.74+1.26) 0.18 =1.9(2.3+2.7-1)=200.18 =1.94=3.6 =7.60.8760+870.5-8.7 0.99990.70.11113.7=8.76+8.75-8.7 =0.1111(90.7)0.11113.7=8.7(6+5-1) =0.11116.30.11113.7=8.710 =0.111110=87 =1.1110.9+0.99+0.999+0.9999 959596-969695=4-0.1-0.01-0.001-0.0001 =1019596-1019695=4-0.1111 =0=3.8889四、解决下列问题（20分）1. 在填上合适的数字。（每题3分，共6分）2.在内填上适当的数，使等式成立。（3分）73.06(4.465+5.535)+42.06=3 2.83.计算下列两题。（每题4分，共8分）10.990.980.970.960.950.940.930.040.030.020.01 =(1-0.98)+(0.99-0.97)+(0.96-0.94)+(0.95-0.93)+(0.04-0.02)+(0.03-0.01)=0.0250=1（10.120.23）（0.120.230.34）（10.120.230.34）（0.120.23）设1+0.12+0.23=A，0.12+0.23=B原式=A(B+0.34)-(A+0.34) B =AB+0.34A-AB-0.34B =0.34A-0.34B =0.34(A-B) =0.341 =0.344.小灵在计算除法时，把除数16错写了19，结果得到的商是17还余13，你能算出它的正确结果吗？（3分）(1917+13)16=33616 =21