小学五年级数学计算能力竞赛试题(附答案)( word 版)
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小学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)
0.8×0.5=0.4 3.7-2.5=1.2 2.8×4=11.2 5.5+55=60.5 10.8÷9=1.2 2.26-0.6=1.66 5.2×4=20.8 1.44÷1.2=1.2 9.1÷7=1.31.25×4=5 4.3×3=12.9 24÷30=0.8
2.2×0.6=1.32 0.75+0.25=1 17÷100=0.17 0.15÷0.3=0.5 20-0.2=19.8 2.5×0.4=1
5.6÷0.2=281÷0.01=100 3.5×0.6=2.1 0.95-0.36=0.59 0.13×4=0.52 84÷4.2=20
0.63+0.47=1.1 0.87÷0.3=2.9 100÷12.5=8 0.25×40=10 1.69÷1.3=1.3 6.5+0.35=6.85
3.5×0.4=1.4 2.5×2.4=6
20-14.2=5.8
0.72÷0.6=1.2 2.3×0.6=1.38 11-1.1=9.9
4.5×6×0.2=
5.4
9÷2.5÷4=0.9
1.7+0.3-1.7+0.3=0.6
2.3×0.2÷2.3×0.2=0.04
12.3×3.1-25.9
=38.13-25.9
=12.23
18-(0.6+2.4×5)
=18-(0.6+12)
=18-12.6
(0.24÷0.3+5)×1.5 =(0.8+5) ×1.5
=5.8 ×1.5(80-9.8)×0.6-2.21 =70.2×0.6-2.21
=42.12-2.21
(12.5-3.6×2.5)÷2 =(12.5-9)÷2
=3.5÷2
[18.95-(8.43+3.87)] ×2.8 = [18.95-12.3] ×2.8
=6.65×2.8
1.7×[34.8÷(4.3+1.7)]
=1.7×[34.8÷6]
=1.7×5.8
1.25÷[(12-9.5)×0.2] =1.25÷[
2.5×0.2]
=1.25÷0.5
(1.9-1.9×0.9)÷(3.8-2.8) = (1.9-1.71)÷1
= 0.19÷1
2.65+8.63+7.35+11.37
=(2.65+7.35)+(8.63+11.37) =8.5-(0.26+1.74) =1.8×(10+0.1)
=1.8×10+1.8×0.1
=18.18
3.34+6.17-1.34+3.83
=(1.25×8)×(0.4×2.5) =930÷(0.6×5) =2+10
=12=10=310
1.9×
2.3+1.9×2.7-1.9 =1.9×(2.3+2.7-1)
=1.9×4
0.87×60+87×0.5-8.7 =8.7×6+8.7×5-8.7
=8.7×(6+5-1)
=8.7×10
0.9999×0.7+0.1111×3.7 =0.1111×(9×0.7)+0.1111×3.7 =0.1111×6.3+0.1111×3.7
=0.1111×10
0.9+0.99+0.999+0.9999
=4-0.1-0.01-0.001-0.0001
=4-0.1111
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 2.8
3.计算下列两题。(每题4分,共8分)
1+0.99-0.98-0.97+0.96+0.95-0.94-0.93+…+0.04+0.03-0.02 =(1-0.98)+(0.99-0.97)+(0.96-0.94)+(0.95-0.93)+……(0.04-0.02)+(0.03-
(1+0.12+0.23)×(0.12+0.23+0.34)-(1+0.12+0.23+0.34)×(0.12 设1+0.12+0.23=A,0.12+0.23=B
=AB+0.34A-AB-0.34B
=0.34A-0.34B
=0.34(A-B)
=0.34×1
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)
(19×17+13)÷16
=336÷16
=21