五年级数学上册计算专项训练附答案(1)

五年级数学上册计算专项训练

1．直接写得数。

2.8－1.9 = 0.36÷0.03 = 0.24÷0.2 = 0.4÷8 =

0.25×6 = 1.25×0.8 = 2.5×4×12 = 0.2×2÷0.2×2= 8.9－5 = 2.1＋0.78 = 5.5÷11 = 3.2÷0.08 =

0.8÷0.04 = 9.3×0.1 = 6.6÷0.6 = 5.6÷7 =

8.95÷0.895 = 34÷0.2 = 6×0.25 = 0.63÷0.9 =

0.6×0.9= 6÷0.6= 7.8÷0.3= 50×0.02=

8.1÷10= 6.4÷0.08= 0.075×100÷10= 12÷2.5÷4= 0.7×11= 36÷0.1= 0.6×30= 7.3×0.1= 2.4×5= 7.2÷0.72= 6.4÷0.8= 3.2÷8= 1.1×3= 0.15÷0.03= 2．用竖式计算。(带☆的要验算)

1.08×

2.1 64÷0.32 0.48×0.135 ☆ 10.5÷0.21

652÷50 = ☆5.6×0.4 = *5.73÷1.6 ≈

3.15×9.6= *8.64÷3.2= △ 21.7÷2.2=

7.3×1.05= 0.76÷1.9= 3.25÷0.96 ≈

(保留两位小数)

3．脱式计算，能简算的要简算。

(7.5－2.3×0.4)÷0.01 2.3＋9×(22－19.7)

1.25×

2.5×

3.2 56.9×1.01－56.9

12.5×32×2.5 6.8×9.9 1.01＋1.01×99

2.5×(

3.2＋1.8÷0.02) 5.5×3.3＋0.67×55 1.47÷［0.4×(8.1－

4.6)］0.25×0.65×40 160＋240×0.3－75 7.4×8.8＋74×0.22－7.4 9.8＋9.8×99 0.52×101－0.52 24.28÷0.8－12.9

7.5×1.8÷1.5 5.6×3.85＋5.6×6.15 4.9÷1.4

4．解方程。

x－10.3 = 2.37 1.8x＋0.6x = 48 1.5÷x = 4

2x－2.4 = 12 8x＋4x＋6 = 42 7.6－4x = 1.2 9x＋6x=15.15 5×(3－2x)=2.5×4.8 7(3x－6)=84

5．计算面积。

(1)求阴影部分的面积。(2)计算下面图形的面积。

参考答案

1．0.9 12 1.2 0.05 1.5 1 120 4

3.9 2.88 0.5 40 20 0.93

11 0.8 10 170 1.5 0.7

0.54 10 26 1 0.81 80 0.75 1.2

7.7 360 18 0.73 12 10 8 0.4 3.3 5

2．2.268 200 0.0648 50(竖式及验算略)

13.04 2.24 3.58 30.24 2.7 9.863 44

7.665 0.4 3.39

3．(7.5－2.3×0.4)÷0.01 2.3＋9×(22－19.7) =(7.5－0.92)÷0.01 = 2.3＋9×2.3

= 6.58÷0.01 = 2.3×(9＋1)

= 658 = 23

1.25×

2.5×

3.2 56.9×1.01－56.9

=(1.25×8)×(2.5×0.4) = 56.9×(1.01－1)

= 10×1 = 56.9×0.01

= 10 = 0.569

12.5×32×2.5 6.8×9.9

=(12.5×8)×(4×2.5) = 6.8×(10－0.1)

= 100×10 = 68－0.68

= 1000 = 67.32

1.01＋1.01×99

= 1.01×(1＋99)

= 101

233 55 1.05 6.5 157 74

980 52 17.45 9 56 3.5

4．x = 12.67 x = 20 x = 0.375

x = 7.2 x = 3 x =1.6

x=1.01 x=0.3 x=6

5．(1) 7×12＋8×(7＋3)÷2－7×(12＋8)÷2 = 54(cm2) (2) (7＋12)×(8－2)÷2＋2×7＋5×7÷2 = 88.5(cm2)