苏教版小数的四则运算过关练习题.docx
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苏教版小数的四则运算过关练习题.docx
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苏教版小数的四则运算过关练习题
计算练习一
一、直接写得数
1-0.01=0.990.2×0.3=0.060.32÷0.4=80.5-0.05=0.45
2.5+6.5=91÷0.01=10010÷0.5=202.4×5=12
二、下列各题怎样算简便就怎样算
13.6+(4.28+6.4)+5.72147.3-28.4-71.6139.46—(58.74+19.46)
=(13.6+6.4)+(4.28+5.72)=147.3-(28.4+71.6)=139.46-19.46-58.74
=20+10=147.3-100=120-58.74
=30=47.3=61.26
1.25×7×0.88.6÷4.5+18.4÷4.512.4÷0.25
=(1.25×0.8)×7=(8.6+18.4)÷4.5=12.4×4
=1×7=27÷4.5=49.6
=7=27÷9÷0.5
=3÷0.5
=3×2
=6
计算练习二
一、直接写得数
3.5×0.2=0.70.72÷0.9=0.81-0.01=0.990.2÷0.01=20
4.8+2=6.80.25×40=109.6÷32=0.31-0.37=0.63
二、下列各题怎样算简便就怎样算
(24+9.6÷2.4)×0.53.83×4.56+3.83×5.445.6÷3.5
=(24+4)×0.5=3.83×(4.56+3.83)=5.6÷7÷0.5
=24×0.5+4×0.5=3.83×10=0.8÷0.5
=12+2=38.3=0.8×2
=14=1.6
(7.2-0.4)×253.65×10.12.5×0.32×1.25
=6.8×25=3.65×(10+0.1)=(2.5×0.4)×(0.8×1.25)
=1.7×(4×25)=3.65×10+3.65×0.1=1×1
=1.7×100=36.5+0.365=1
=170=36.865
计算练习三
一、直接写得数
4.3+0.57=4.871.25×16=202÷5=0.40.81÷0.9=0.9
5.5+1.45=6.950.7×1.3=0.919.4÷0.01=94010.1×2.3=23.23
二、下列各题怎样算简便就怎样算
6.136×86+86×3.86453.4÷0.25÷0.4101×5.3
=(6.136+3.864)×86=53.4÷(0.25×0.4)=(100+1)×5.3
=10×86=53.4÷0.1=100×5.3+5.3
=860=534=530+5.3
=535.3
7.3×4.6+5.4×7.37.4×0.998.5-0.24-1.76
=7.3×(4.6+5.4)=7.4×(1-0.01)=8.5-(0.24+1.76)
=7.3×10=7.4-7.4×0.01=8.5-2
=73=7.4-0.074=6.5
=7.326
计算练习四
一、直接写得数
2÷0.125=1627÷54=0.52.5×12=304.52+6.48=11
0.2+0.7=0.95.9-5=0.91.4×0.3=0.420.75÷0.5=1.5
二、下列各题怎样算简便就怎样算
3.75×0.5+6.25÷26.3×2.1-0.633.65÷2.5÷4
=3.75×0.5+6.25×0.5=6.3×2.1-6.3×0.1=3.65÷(2.5×4)
=(3.75+6.25)×0.5=6.3×(2.1-0.1)=3.65÷10
=10×0.5=6.3×2=0.365
=5=12.6
5.6÷350.35×2011.3+0.69+0.7
=5.6÷7÷5=0.35×(200+1)=(1.3+0.7)+0.69
=0.8÷5=0.35×200+0.35=2+0.69
=0.8×0.2=70+0.35=2.69
=0.16=70.35
计算练习五
一、直接写得数
0.8÷1.6=0.52+0.03=2.031-0.25=0.751.8+0.02=1.82
8.01+0.19=8.23.5+6.5=106÷12=0.58.4÷0.4=21
二、下列各题怎样算简便就怎样算
12.3×99+12.30.38+9.6÷3.2×5.47.6-(3.05+2.6)
=12.3×(99+1)=0.38+3×5.4=7.6-2.6-3.05
=12.3×100=0.38+16.2=5-3.05
=1230=16.58=1.95
6.3÷0.5÷2270÷4.520-3.7-7.3
=6.3÷(0.5×2)=270÷9÷0.5=20-(3.7+7.3)
=6.3÷1=30÷0.5=20-11
=6.3=30×2=9
=60
计算练习六
一、直接写得数
5×0.7=3.51÷0.25=412.5×8=1000.16÷0.4=0.4
0.04×20=0.816×2.5=4055.8÷1000=0.05586.03×10=60.3
二、下列各题怎样算简便就怎样算
6.3+4.82+3.7-0.82307×10.10.45×18
=(6.3+3.7)+(4.82-0.82)=307×(10+0.1)=0.45×2×9
=10+4=307×10+307×0.1=0.9×9
=14=3070+30.7=8.1
=3100.7
132-43.7-56.30.32×12.5×2.55.6×1.25
=132—(43.7+56.3)=(0.8×12.5)×(0.4×2.5)=0.7×(8×1.25)
=132-100=10×1=0.7×10
=32=10=7
计算练习七
一、直接写得数
3.4-1.4=27.82-7.2=0.622.19+9.1=11.2910.1-0.89=9.21
0.68+0.42=1.18.1-5.1=30.728-0.24=0.4880.8+0.18=0.98
二、下列各题怎样算简便就怎样算
7.6×21-7.672÷1.25÷87.3+2.7-7.3+2.7
=7.6×(21-1)=72÷(1.25×8)=(7.3-7.3)+(2.7+2.7)
=7.6×20=72÷10=0+5.4
=152=7.2=5.4
(7.7+15.4)÷79.9×341.5×1.2+8.8×1.5
=7.7÷7+15.4÷7=(10-0.1)×34=1.5×(1.2+8.8)
=1.1+2.2=10×34-0.1×34=1.5×10
=3.3=340-3.4=15
=336.6
计算练习八
一、直接写得数
0.89-0.25=0.640.5×400=20019.9+11.1=31187÷1000=0.187
1+3.89=4.890.081×10=0.8175÷10=7.5100-35.22=64.78
二、下列各题怎样算简便就怎样算
4.7×8.3+5.3×8.37.12×4-1.12×4450÷2.5÷2
=(4.7+5.3)×8.3=(7.12-1.12)×4=450÷(2.5×2)
=10×8.3=6×4=450÷5
=83=24=90
12.5×8.8(125-1.25)×0.83.5×0.4+3.5×0.6
=(12.5×8)×1.1=125×0.8-1.25×0.8=3.5×(0.4+0.6)
=100×1.1=100-1=3.5×1
=110=99=3.5
计算练习九
一、直接写得数
2.5×0.4=12.4×5=120.22×4=0.880.9-0.52=0.38
3.99×1=3.990×3.52=02.5÷5=0.58.4÷7=1.2
二、下列各题怎样算简便就怎样算
39÷(1.3×5)2.2÷4+0.6÷44.83÷5+2.17÷5
=39÷1.3÷5=(2.2+0.6)÷4=(4.83+2.17)÷5
=30÷5=2.8÷4=7÷5
=6=0.7=1.4
42÷3.526.7-0.5×5-7.548.4+2.78+51.6-0.48
=42÷7÷0.5=26.7-2.5-7.5=(48.4+51.5)+(2.78-0.48)
=6÷0.5=26.7-(2.5+7.5)=100+2.3
=6×2=26.7-10=102.3
=12=16.7
计算练习十
一、直接写得数
0.8×7=5.61.5×7=10.51.02×8=8.1610.3×2=20.6
5×0.6=30.9×0.3=0.273.5×0.2=0.72.01×0=0
二、下列各题怎样算简便就怎样算
4.8+8.63+5.2+0.375.93+0.19+2.811.76+0.195+3.24
=(4.8+5.2)+(8.63+0.37)=5.93+(0.19+2.81)=(1.76+3.24)+0.195
=10+9=5.93+3=5+0.195
=19=8.93=5.195
2.35+1.713+0.287+7.651.57+0.245+7.436.02+3.6+1.98
=(2.35+7.65)+(1.713+0.287)=(1.57+7.43)+0.245=(6.02+1.98)+3.6
=10+2=9+0.245=8+3.6
=12=9.245=11.6
计算练习十一
一、直接写得数
10×0.05=0.50.13×7=0.910.21×100=210.7×4=2.8
0.05×4=0.24×0.3=1.22.3×4=9.23.25×0=0
二、下列各题怎样算简便就怎样算
0.134+2.66+0.8661.27+3.9+0.73+16.17.5+4.9-6.5
=(0.134+0.866)+2.66=(1.27+0.73)+(3.9+16.1)=7.5-6.5+4.9
=1+2.66=2+20=1+4.9
=3.66=22=5.9
3.07-0.38-1.621.29+3.7+2.71+6.38-2.45-1.55
=3.07-(0.38+1.62)=(1.29+2.71)+(3.7+6.3)=8-(2.45+1.55)
=3.07-2=4+10=8-4
=1.07=14=4
计算练习十二
一、直接写得数
0.4×50=2030×0.1=32.6×3=7.84.1×2=8.2
0.35×0.2=0.077.5×0.1=0.751-0.08=0.923.5×0.01=0.035
二、下列各题怎样算简便就怎样算
3.25+1.79-0.59+1.7523.4-0.8-13.4-7.20.32×403
=(3.25+1.75)+(1.79-0.59)=(23.4-13.4)-(0.8+7.2)=0.32×(400+3)
=5+1.2=10-8=0.32×400+0.32×3
=6.2=2=128+0.96
=128.96
3.2+0.36+4.8+1.641.23+3.4-0.23+6.60.25×36
=(3.2+4.8)+(0.36+1.64)=(1.23-0.23)+(3.4+6.6)=(0.25×4)×9
=8+2=1+10=1×9
=10=11=9
计算练习十三
一、直接写得数
1.25÷0.25=53.9+0.39=4.294.8+5.2=100.5×0.4=0.2
4÷0.25=163÷4=0.758.1÷9=0.92.5×4=10
二、下列各题怎样算简便就怎样算
12.7-(3.7+0.84)36.54-1.76-4.540.25×0.73×4
=12.7-3.7-0.84=36.54-4.54-1.76=(0.25×4)×0.73
=9-0.84=32-1.76=1×0.73
=8.16=30.24=0.73
7.6×0.8+0.2×7.60.85×1990.25×8.5×4
=7.6×(0.8+0.2)=0.85×(200-1)=(0.25×4)×8.5
=7.6×1=0.85×200-0.85=1×8.5
=7.6=170-0.85=8.5
=169.15
计算练习十四
一、直接写得数
6-0.025=5.9753.6+6.3=9.90.05×4=0.20÷3.5=0
0.9×0.3=0.271×0.06=0.060.09×30=2.79×0.5=4.5
二、下列各题怎样算简便就怎样算
1.28×8.6+0.72×8.612.5×0.96×0.810.4-9.6×0.35
=(1.28+0.72)×8.6=(12.5×0.8)×0.96=10.4-3.36
=2×8.6=10×0.96=7.04
=17.2=9.6
0.8×(4.3×1.25)3.12+3.12×9928.6×101-28.6
=(0.8×1.25)×4.3=3.12×(1+99)=28.6×(101-1)
=1×4.3=3.12×100=28.6×100
=4.3=312=2860
计算练习十五
一、直接写得数
1.25×8=102.6×3=7.84.1×2=8.20.35×0.2=0.07
7.5×0.1=0.750.9×0.3=0.271×0.06=0.069×0.5=4.5
二、下列各题怎样算简便就怎样算
(4.23+6.17)×0.80.86×15.7-0.86×14.72.4×102
=11×0.8=0.86×(15.7-14.7)=2.4×(100+2)
=8.8=0.86×1=2.4×100+2.4×2
=0.86=240+4.8
=244.8
14-7.32-2.682.64+8.67+7.36+11.332.31×1.2×0.5
=14-(7.32+2.68)=(2.64+7.36)+(8.67+11.33)=2.31×(1.2×0.5)
=14-10=10+20=2.31×0.6
=4=30=1.386
计算练习十六
一、直接写得数
1.25×8=100.2×0.4=0.088.2+1.8=106.4÷0.8=8
3.9÷0.3=130.24÷2=0.120.1×0.2=0.021.4×3=4.2
二、下列各题怎样算简便就怎样算
(2.5-0.25)×0.49.16×1.5-0.5×9.163.6-3.6×0.5
=2.5×0.4-0.25×0.4=9.16×(1.5-0.5)=3.6×(1-0.5)
=10-1=9.16×1=3.6×0.5
=9=9.16=1.8
4.5÷1.84.2÷3.5930÷0.6÷5
=4.5÷0.9÷2=4.2÷0.7÷5=930÷(0.6×5)
=5÷2=6÷5=930÷3
=2.5=1.2=310
计算练习十七
一、直接写得数
3.2÷0.4=80.32÷0.08=40.7÷0.01=702.9÷0.1=29
1÷0.02=500.9÷0.45=228÷0.4=705.8-0.5=5.3
二、下列各题怎样算简便就怎样算
63.4÷2.5÷0.44.9÷1.43.9÷(1.3×5)
=63.4÷(2.5×0.4)=4.9÷0.7÷2=3.9÷1.3÷5
=63.4÷1=7÷2=3÷5
=63.4=3.5=0.6
(7.7+1.54)÷0.72.5×2.42.7÷45
=7.7÷0.7+1.54÷0.7=(2.5×0.4)×6=2.7÷9÷5
=11+2.2=1×6=0.3÷5
=13.2=6=0.06
计算练习十八
一、直接写得数
0.57-0.5=0.076.2+0.08=6.288+1.04=9.046.2÷3.1=2
7.3+1.4=8.73.9-2=1.90.2+1.8=21-0.35=0.65二、下列各题怎样算简便就怎样算
0.35×1.25×2×0.832.4×0.9+0.1×32.415÷0.25
=(0.35×2)×(1.25×0.8)=32.4×(0.9+0.1)=15×4
=0.7×1=32.4×1=60
=0.7=32.4
70÷2815÷(0.15×0.4)4.25÷2.5+0.17
=70÷7÷4=15÷0.15÷0.4=1.7+0.17
=10÷4=100÷0.4=1.87
=2.5=250
计算练习十九
一、直接写得数
0.6+0.24=0.840.58-0.4=0.180.8+0.35=1.150.8+0.3=1.1
0.35+0.21=0.5612.3÷10=1.232.3÷10=0.230.16×10=1.6
二、下列各题怎样算简便就怎样算
(1.25-0.125)×87.74×1.5+1.5×2.2621×5.6-5.6
=1.25×8-0.125×8=(7.74+2.26)×1.5=(21-1)×5.6
=10-1=10×1.5=20×5.6
=9=15=112
36.54-1.76-4.5423.4-0.8-13.4-7.213.7×0.25-3.7÷4
=36.54-4.54-1.76=(23.4-13.4)-(0.8+7.2)=13.7×0.25-3.7×0.25
=32-1.76=10-8=(13.7-3.7)×0.25
=30.24=2=10×0.25
=2.5
计算练习二十
一、直接写得数
0.46+0.34=0.81-0.78=0.222.7×3=8.19.3÷0.93=10
0.25×0.7×4=0.70.54÷18=0.030.025×4.4=0.117.38-5.88=1.5
二、下列各题怎样算简便就怎样算
4.9÷1.40.85×1993.2×0.25×12.5
=4.9÷0.7÷2=0.85×(200-1)=(4×0.25)×(0.8×12.5)
=7÷2=0.85×200-0.85=1×10
=3.5=170-0.85=10
=169.15
3.6×1023.72×3.5+6.28×3.536.8-3.9-6.1
=3.6×(100+2)=(3.72+6.28)×3.5=36.8-(3.9+6.1)
=3.6×100+3.6×2=10×3.5=36.8-10
=360+7.2=35=26.8
=367.2
计算练习二十一
一、直接写得数
0.76-0.6=0.163.6+4=7.650+0.5=50.510-0.01=9.99
2.5+8.5=1110-0.1=9.90.5+0.7=1.23.18+2.02=5.2
二、下列各题怎样算简便就怎样算
15.6×12.1-15.6×2.14.8×7.8+7.8×5.232+4.9-0.9
=15.6×(12.1-2.1)=(4.8+5.2)×7.8=32+(4.9-0.9)
=15.6×10=10×7.8=32+4
=156=78=36
4.8×100.156.5×9.9+56.57.09×10.8-0.8×7.09
=4.8×(100+0.1)=56.5×(10-0.1+1)=7.09×(10.8-0.8)
=4.8×100+4.8×0.1=56.5×10-56.5×0.1+56.5=7.09×10
=480+0.48=565-5.65+56.5=70.9
=480.48=615.85
计算练习二十二
一、直接写得数
0.4÷0.01=401.25×16=203.4×1.01=3.4343.2÷1.6=2
8.8÷2.2=40.75×4=3500×0.01=56.2×0.3=1.86
二、下列各题怎样算简便就怎样算
25.48-(9.4-0.52)4.2÷3.5320÷1.25÷8
=25.48+0.52-9.4=4.2÷0.7÷5=320÷(1.25×8)
=26-9.4=6÷5=320÷10
=16.6=1.2=32
18.76×9.9+18.763.52÷2.5÷0.43.9-4.1+6.1-5.9
=18.76×(9.9+1)=3.52÷(2.5×0.4)=(3.9+6.1)-(4.1+5.9)
=18.76×(10+0.9)=3.52÷1=10-10
=18.76×10+18.76×0.9=3.52=0
=187.6+16.884
=204.484
计算练习二十三
一、直接写得数
3.6+4=0.76-0.6=2.5+8.5=10-0.01=
0.4÷0.01=1.25×16=3.4×1.01=3.2÷1.6=
二、下列各题怎样算简便就怎样算
5.6÷3.59.6÷0.8÷0.44.2×99+4.2
17.8÷(1.78×4)0.49÷1.41.25×2.5×32
计算练习二十四
一、直接写得数
8.8÷2.2=0.75×4=500×0.01=6.2×0.3=
25×40=5.2×5=0.35×4=0.2×2.4=
二、下列各题怎样算简便就怎样算
15.2÷0.25÷40.89×100.1146.5-(23+46.5)
3.83×4.56+3.83×5.444.36×12.5×89.7×99+9.7
计算练习二十五
一、直接写得数
1-0.6=4÷8=0.16÷1.6=1-0.81=
0.76-0.6=3.7+3=2.5+8.5=10-0.01=
二、下列各题怎样算简便就怎样算
27.5×3.7-7.5×3.78.54÷2.5÷0.40.65×101
12.4÷8÷0.1255.6÷1.25÷0.88.9×1.01
计算练习二十六
一、直接写得数
0.4÷0.01=1.25×16=3.4×1.01=3.2÷1.6=
8.8÷2.2=0.75×4=500×0.01=6.2×0.3=
二、下列各题怎样算简便就怎样算
3.9×2.7+3.9×7.31.8÷0.125÷0.812.7×9.9+12.7×0.1
21×5.6-5.615.02-6.8-1.025.4×11-5.4
计算练习二十七
一、直接写得数
50×0.5=50÷0.5=9.8÷0.01=6.5÷25=
3.5×0.2=0.72÷0.9=1-0.01=0.2÷0.01=
二、下列各题怎样算简便就怎样算
2
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