四年级下数学简便运算专项练习

四年级下册数学简便运算专项练习

一、直接写出得数。(10分)

0.8×60=7.2+2.8=12.4—4=1.3+0.03=

10—0.01=2.5×100=3.2+8=20—4.5=

0.4×2.5=0.8×1.25=0.3×3.6=0.21×0.3=

1.5×0.4=6.02+0.18=9.8-4.8=1.2+0.5=

0.3×1.4=0.75+2.8=1.25×8=0.14×4=

5.5×0.1=0.3×0.4=0.1×1000=2.3×10=

7×1.8=15×0.01=10—0.9=0.8×0.5=

12×0.4=1.4+0.46=4—2.3=25×0.2=

0.03×9=7—5.08=0×8.93=1.7-1.07=

1—0.29=1.2+0.08=0.92×0.4=0.76+0.24=

二、用竖式计算。(18分)

6.86+2.63=13.6+2.87=11.38-7.95=

12-6.89=6.94+12.7=8.72+5.36=

9.5×8.3=6.3×9.2=4.85×0.46=

500×0.35=2.9×1.7=3.56×0.15=

三、脱式计算。(能简算的要简算)(24分)

18.36+6.28-1.533.8+1.94+0.2+1.0687.5-3.25—6.75

1.25×0.25×329.75—(0.9+3.85)28.9-1.2×0.8

9.5×1013.8+(8.8-4.9)×24.75×99+4.75

13.7×6.1+3.9×13.74.6×7.8+3.2×4.6-4.60.25×1.1×40

四、解方程。(30分)

x—3.6=8.525x=125x÷1.5=13.4

5x+0.8=20.82x+31=658x÷25=16

5x—45=103x+12.7=42.76x—48=72

2x—5.6=12.43x+26=806x—70=110

x÷3.5=134x+1.8=17.85x—115=375

五、下面的计算对吗?对的画“√”,错的画“×”并改正。(8分)

改正：

()

()

3.2.5×(8+0.4)改正：4.6x=126改正：

=2.5×8+0.4解：6x÷6=126×6

=20+0.4x=756

=20.4()

()

六、看图列式计算。(10分)

200克2.

1.400克x个

沙包

多3个

毽子

75个

3.1.2米0.25米4.24.6米

红绳

多12.8米

蓝绳

?米0.18米?米

计算4.6×7.8+3.2×4.6—4.6

=4.6×(7.8+3.2-1)

一、48108.41.33

=4.6×10

9.9925011.215.5

111.080.063=46

0.66.251.70.25×1.1×40

0.423.55100.56=0.25×40×1.1

0.550.1210023

=10×1.1

12.60.159.10.4=11

4.81.861.75四、

0.271.9200.63x—3.6=8.525x=125

0.711.280.3681解：x=8.5+3.6解：x=125÷25

二、9.4916.473.43x=12.1x=5

5.1119.6414.08x÷1.5=13.45x+0.8=20.8

78.8557.962.231解：x=13.4×1.5解：5x=20

1754.930.534

x=20.1x=4

三、18.36+6.28—1.532x+31=658x÷25=16

=24.64—1.53解：2x=34解：8x=400

=23.11

x=50

3.8+1.94+0.2+1.06x=17

=(3.8+0.2)+(1.94+1.06)5x—45=103x+12.7=42.7

=4+3解：5x=55解：3x=30

=7

x=11x=10

87.5-3.25—6.756x—48=722x—5.6=12.4

=87.5—(3.25+6.75)

=87.5-10解：6x=120解：2x=18

=77.5x=20x=9

1.25×0.25×323x+26=806x-70=110

=1.25×0.25×8×4解：3x=54解：6x=180

=(1.25×8)×(0.25×4)

x=18x=30

=10×1

x÷3.5=134x+1.8=17.8

=10

解：x=13×3.5解：4x=16

9.75—(0.9+3.85)

x=45.5x=4

=9.75-4.75

=55x-115=375

解：5

28.9-1.2×0.8x=490

=28.9-0.96x=98

=27.94五、1.×2.×

9.5×101

=9.5×(100+1)

=9.5×100+9.5×1

=950+9.5

=959.53.×2.5×(8+0.4)

3.8+(8.8—4.9)×2=2.5×8+2.5×0.4

=3.8+3.9×2

=3.8+7.8=20+1

=21

=11.6

4.×6x=126

4.75×99+4.75

=4.75×(99+1)解：6x÷6=126÷6

=4.75×100