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

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