人教版四年级数学下册小数加减法混合运算专项练习题51.docx
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人教版四年级数学下册小数加减法混合运算专项练习题51
一、口算。
8.9+0.4=8.1-1.1=0.84-0.41=4.7-0.8=
6.4+0.4=7.2-1.9=0.83+0.34=4.8-0.4=
2+0.1=8.8-2.1=0.69+0.41=1.8-0.2=
4.3-0.1=7.3+1.5=0.68+0.33=5.4-0.8=
8.4+0.3=7.1-0.4=0.6+0.39=8.5-0.4=
4-0.8=6.1+4.1=0.73+0.36=3.2+0.9=
3.1-0.4=8.7-3.8=0.66-0.21=2.3-0.1=
8.7-0.9=7.4+2=0.81+0.32=3.4+0.2=
二、混合运算。
0.71-0.42+7.19.1-0.77-4.2391.1-75.4-10.6
70.57-15.76+79.7579.28-42.17+23.343.68-2+1.22
90-(7.48+0.25)83.1+(26.4+8.4)7.21-4.93+1.66
一、口算。
1.6-0.6=8.5-2.1=0.77-0.3=6.8-0.3=
8.9-0.5=8.2-0.6=0.8-0.38=4.8+0.4=
7.1+0.4=7-1.2=0.64+0.46=4.8+0.6=
4.7-0.1=6.6-1.1=0.75-0.02=8.4+0.9=
5.8-0.4=6.2+0.5=0.72-0.47=3.2+0.5=
2.8-0.7=6.4+0.7=0.79+0.41=6.9-0.2=
6.2-0.4=8.9-4.1=0.67+0.03=1.7+0.2=
1.9-0.5=7.6+0.5=0.65+0.34=3.6-0.3=
二、混合运算。
0.62-0.16+6.26.6-0.22-0.7838.6+13.4-25.2
86.75+12.98+67.8582.26-40.8+92.344.62-2.87-1.61
50-(5.29+0.15)97.6+(10.5-1.6)6.82+4.11-1.41
一、口算。
3.1-0.7=7.8-3.2=0.66+0.06=9+0.8=
3.9-0.5=6.8-4.4=0.76+0.26=4.8-0.3=
7.8+0.7=6.4-1.4=0.81+0.08=3.5+0.8=
3.2+0.8=6.3+4.5=0.62-0.28=8+0.4=
1.9+0.6=6+0.9=0.79-0.14=5.6-0.8=
1.5+0.5=8.7+0.1=0.7-0.49=3.8+0.8=
6.3+0.3=9+3.9=0.86-0.4=3.9-0.6=
1+0.4=8.7+4.8=0.72+0.07=8.3+0.8=
二、混合运算。
0.74+0.11+7.99.1-0.26-4.7470.5+27.1-24.1
87.29-40.04+85.1188.29+10.37+10.254.46-1.24+1.47
50-(5.09-0.82)66.7-(13.9-1.5)7.3+1.91-4.45
一、口算。
3.2+0.4=6.2+4.9=0.79-0.28=2.7-0.4=
3.7-0.1=8.3+1.7=0.63+0.35=8.7-0.4=
1.1+0.8=6.9+1.5=0.78-0.15=8.4+0.2=
5.8-0.1=8+3.7=0.89-0.31=6.2+0.1=
5.9+0.5=7.9-0.6=0.67+0.19=6.8-0.6=
6+0.2=7.9+3.4=0.82-0.44=5.3+0.1=
5.1-0.1=8.4-1.6=0.6+0.01=8.9+0.6=
4.5-0.7=7-2.5=0.83-0.47=6.9+0.8=
二、混合运算。
0.68-0.49+4.79-0.63-0.3742.5-11.4-29.5
71.44+25.47+46.2273.72-22.92+63.776.2+2.83+1.89
30-(2.74-0.35)78.7-(18+3.6)9.42+6.77-1.64
一、口算。
3.9+0.3=7.2+1.6=0.78-0.3=2.8+0.4=
7-0.8=6.3+2.8=0.71-0.02=5.5-0.6=
5.5+0.2=6.5-0.1=0.7-0.06=6.2+0.1=
8.1+0.8=7.3+0.1=0.86-0.18=4.8+0.4=
3.7-0.6=8.1-3.3=0.64-0.16=4.2+0.9=
8+0.2=8.2+0.8=0.68+0.15=7.1+0.6=
7.1-0.3=8.5-2.8=0.74+0.04=2.3-0.1=
7.6-0.9=6+0.9=0.88-0.31=3.2-0.1=
二、混合运算。
0.66-0.15+0.69-0.9-3.183-65.6+14.3
66.78-26.06+95.6988.92-39.36+94.767.74+1.64+2.31
50-(3.85-0.72)79.1+(20.5-9.9)8.92-1.3-5.87
一、口算。
4-0.2=7.5-1.8=0.87+0.28=4.5-0.2=
4.9-0.5=8.6-4.6=0.78-0.03=7.5-0.1=
7.2+0.4=8.7-4.1=0.67+0.08=2.4+0.8=
4.3-0.9=8.7+4.5=0.89-0.38=8.4+0.7=
1.8+0.5=6.3-3.7=0.73+0.4=7.5-0.8=
5.8+0.9=6.6+3.8=0.83+0.02=4+0.5=
4.8+0.9=6.7+0.9=0.73+0.18=5.4+0.5=
5.8+0.5=8.4-3.6=0.82+0.39=2.5-0.9=
二、混合运算。
0.61-0.13+6.89.9-0.83-4.1746.6-18.6+17.3
75.54-26.01+49.4462.42+10.41+41.325.39-2.19+2.68
20-(9.02+0.24)67.5-(22.4+2.1)5.23+2.07-2.19
一、口算。
7.6+0.2=7.3+0.9=0.85-0.35=8.7+0.7=
4.3-0.5=7.7+3.7=0.72-0.3=1.1+0.6=
3+0.6=6+3.7=0.88-0.11=4.2-0.9=
2.9-0.9=8.8-1.2=0.74-0.01=4.3-0.4=
7.2+0.4=7.3-0.8=0.66+0.03=1.8+0.8=
1+0.8=7.2+0.6=0.61-0.13=8.1+0.3=
3.5-0.1=8.5-1.6=0.78-0.33=3.3-0.3=
3.7+0.4=6.4-1.7=0.83+0.34=7.8+0.7=
二、混合运算。
0.61-0.18+9.78.5-0.32-2.6848.3+30.8+10.1
78.36+39.9+23.5461.66-13.45+68.56.96-3.07+1.77
60-(4.63-0.89)72.6-(28.5+4.4)4.47+2.13+1.26
一、口算。
5.2-0.8=8.3-1.9=0.63-0.17=1-0.9=
5.3+0.1=8.2+4.5=0.64-0.31=1.1-0.6=
3.4+0.4=6.4+3.8=0.88+0.32=3+0.9=
7.6+0.9=8.8-4.5=0.63-0.21=6.9+0.1=
8+0.4=8.3-4.2=0.77-0.09=3-0.6=
1.2+0.1=6.8-0.7=0.63+0.38=3.7+0.5=
5.1-0.5=8.8+1.9=0.6-0.03=1.8-0.3=
1.2+0.7=8.8+2.1=0.83+0.19=8.9-0.2=
二、混合运算。
0.61-0.4+9.59.6-0.23-4.7763.3+28.5-23.6
69.92+41.62+3672.27-12+36.833.55+1.91-1.43
70-(4.25+0.11)80.3-(22.9-7.6)6.32-2.77-1.72
一、口算。
7.6+0.7=8.4+4.9=0.7-0.11=5.8-0.7=
5.4+0.3=8.4-1.9=0.78+0.47=4.2+0.6=
5.7+0.1=8.5+2=0.61+0.26=5.8-0.4=
2.6-0.3=7.9+2.6=0.82+0.06=5.1-0.6=
6.3-0.4=7.2-2.7=0.62+0.3=8.8-0.4=
5.4-0.9=8.7+4.4=0.62+0.33=7.5+0.9=
4.7-0.2=7.2-4.4=0.9+0.3=2.1+0.5=
5.1+0.1=8.9+3.5=0.9-0.04=3.4-0.2=
二、混合运算。
0.7+0.23+8.26.7-0.1-3.989.5-63.3+11.2
85.38-12.22+19.6684.49+44.75+25.515.73-3.02-2.44
60-(7.28-0.73)74.8-(15.9-7.9)8.4+1.87-3.07
一、口算。
8.7+0.1=7.6-1.1=0.69-0.36=3.7+0.5=
8.6+0.4=7.2-1.2=0.7-0.24=8.2+0.4=
3.3-0.4=7.1-3.1=0.64-0.16=5.1+0.3=
7.5-0.8=8.1-4.6=0.66+0.07=7.5-0.4=
8.6-0.1=7.8+4.4=0.68-0.39=5.9+0.7=
8.4-0.4=9-0.9=0.68+0.17=5.2+0.4=
8.2+0.6=7.4-2.8=0.79-0.48=7.8+0.3=
5.2-0.5=7.8+2.3=0.77-0.38=4.3+0.6=
二、混合运算。
0.88+0.23+6.16.7-0.34-4.6642.5-13.7+12.6
79.41+11.5+93.3773.19-46.7+31.744.77-3.18+1.47
70-(9.1-0.29)93.8-(28.1+4.2)5.38-3.83-1.33
一、口算。
8.1+0.6=6.5-3.9=0.89+0.13=5.5+0.5=
2.4-0.5=7.6-3.4=0.85+0.38=7.7+0.1=
6.2+0.6=7.5+4.6=0.64-0.41=4.3+0.6=
7.5+0.4=8.5+2.8=0.64-0.49=2.2-0.2=
6.6-0.9=6.3-4=0.8+0.14=6.1+0.3=
3.7+0.7=6.9-1.7=0.9-0.1=5.8+0.8=
5-0.3=8.6+4.5=0.83-0.31=4.3+0.2=
5.1-0.3=8.4+4.4=0.73-0.2=4.9+0.7=
二、混合运算。
0.78-0.49+7.96.9-0.56-3.4448.6-13.4-22.7
62.39+30.29+27.7978.61+35.25+30.433.58-1.64+1.2
90-(1.54+0.67)96.3+(27.5+5.4)9.38-4.1+4.86
一、口算。
4.3-0.3=8+2.2=0.7+0.43=1.6-0.6=
3-0.6=7.6+4.4=0.88-0.04=7.2+0.2=
7.9+0.9=6.4+0.8=0.71+0.26=2.9-0.5=
7-0.8=6.3-1.2=0.83-0.29=6.6-0.2=
7.8-0.1=6.2+2.1=0.72+0.14=5+0.4=
5+0.7=8.5-4.6=0.7+0.34=8.4+0.2=
2.2-0.1=7.7+0.6=0.85+0.35=8.5+0.1=
4.7+0.8=7.6+3=0.69+0.29=5.5-0.3=
二、混合运算。
0.72+0.27+1.29.3-0.28-1.7287-48.2-23.8
61.09+12.31+71.6773.39-10.9+16.998.15+6.28-1.28
60-(1.7-0.34)78.7-(19.2+1.5)7.44+4.74-2.2
一、口算。
7.7-0.8=7.6-2.9=0.9+0.43=2.5-0.1=
2.7-0.6=8.5+4.6=0.78+0.02=8.2+0.4=
4.3-0.2=8.3-2.1=0.88-0.42=8.7+0.1=
1.4-0.9=8.1-1=0.83+0.02=2.4+0.7=
6.2+0.9=6.2+0.5=0.73-0.22=2.6+0.7=
1.5-0.1=9+1.7=0.77+0.3=7.5+0.3=
1.7-0.6=7.6-1.1=0.89-0.21=3.9+0.6=
4.4+0.9=7.5+4.7=0.85-0.37=6.4-0.4=
二、混合运算。
0.7-0.3+4.47.4-0.66-1.3471.2-52.1-12.8
79.74-43.39+92.3665.51-32.28+49.685.74+3.88-1.03
20-(8.32-0.81)98.7+(17.2+8.1)5-1.43-2.9
一、口算。
4+0.2=8.9-1.6=0.9+0.34=3.2+0.6=
1.6+0.8=6.4+3.6=0.78-0.3=7.8+0.6=
7.3+0.2=6.6+2.7=0.64+0.36=5.6-0.6=
1.1+0.4=7.4+2.9=0.9+0.44=5.6-0.6=
6.1-0.6=7.9-1.5=0.75+0.22=6.4-0.8=
8.6+0.3=8.8-3.1=0.6+0.38=8.7+0.2=
2.7+0.8=6.2+3.1=0.64+0.39=1.7+0.1=
2+0.3=7.8-3.7=0.68-0.46=8.6-0.3=
二、混合运算。
0.62-0.13+1.75-0.45-3.5572.7+29+38.3
66.83-47.57+49.3285.43+26.21+41.438.29-5.13+2.11
50-(2.28-0.68)99.6-(28.7+8.1)7.55-5.09+1.43
一、口算。
3.3+0.9=8.7+3.4=0.81-0.13=4.2+0.6=
1.4+0.5=6.8+3.2=0.87+0.49=3.8+0.4=
8.2+0.6=6.5+2.3=0.8-0.4=2.9-0.4=
1.9-0.3=8.2-0.8=0.79+0.27=6.5+0.6=
4.5+0.1=7.6+1.9=0.68+0.47=5.8-0.3=
7.4-0.9=6.4+1.8=0.85-0.25=3.5-0.4=
7-0.8=8.6-4=0.62+0.06=8-0.1=
4.6-0.7=7+2.1=0.75+0.28=4.7-0.8=
二、混合运算。
0.87-0.37+3.49.2-0.75-0.2593.3+78.1-12.8
81.51-13.43+35.5774.12-14.07+80.29.18-4.62+2.37
20-(8.75-0.22)87.9+(27.3-8.6)8.58+4.34-3.2
一、口算。
8.7-0.9=6.3-3.3=0.88-0.48=4.9+0.5=
8.7-0.1=8.3+4.5=0.74-0.38=8.5-0.8=
3.7-0.5=6.4+3.7=0.73-0.1=7.7-0.1=
5-0.2=8+2.3=0.73+0.2=6.8-0.1=
5.5-0.6=8.5-3=0.79+0.24=7.3-0.7=
8-0.6=7.8-0.9=0.81+0.2=3.5-0.9=
8.7-0.5=7.9-3=0.62-0.09=1-0.2=
2.3+0.2=6.6+4.5=0.79+0.48=6.3-0.5=
二、混合运算。
0.79+0.04+8.19.1-0.33-1.6770.9-16.7+33.8
89-28.06+98.7381.52+20.14+37.874.15+1.88-2.18
50-(3.38+0.13)95.6-(30+1.7)3.82+2.14+1.31
一、口算。
8.7-0.8=6.7+0.7=0.83-0.04=3.7-0.3=
5-0.4=8.5-1.8=0.85+0.43=5.3+0.6=
2.9-0.7=6.7-1.7=0.75+0.49=6.9+0.4=
4.6+0.4=7+1.9=0.69-0.41=1.3-0.6=
8.6-0.7=6.2-1.9=0.75+0.29=8.5-0.5=
8.3-0.4=7.6-1=0.66+0.02=9+0.6=
5.2+0.4=7.8-1.1=0.75-0.42=7.2-0.4=
6.2+0.3=8.4-1.8=0.63+0.48=6.9+0.5=
二、混合运算。
0.66-0.49+4.97.4-0.76-2.2489.4+70.5+14.4
82.83+47.11+83.7783.57-46.3+57.743.67-1.49+1.15
30-(5.68-0.39)83.5-(27.2-1.8)3.61+1.7-1.56
一、口算。
6.5-0.4=6.5-0.1=0.88-0.36=6.7+0.3=
5.5+0.5=7.7+4.6=0.68+0.25=5.1+0.5=
7.5-0.9=6.2+1