四年级数学下册小数加减法混合运算专项练习18.docx
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四年级数学下册小数加减法混合运算专项练习18
一、口算。
1.9+0.1=7-4.1=0.79+0.46=5.3-0.7=
2.1+0.5=8.6+4=0.84+0.44=8.9-0.2=
5.8-0.8=7.4-4.1=0.88+0.45=5.2+0.1=
5.4+0.9=7.7-2.4=0.79+0.11=5.5+0.5=
3.5-0.5=6.9+2.9=0.9-0.48=5.3+0.7=
6.5-0.1=8.6+0.6=0.82+0.49=4.5+0.6=
6+0.9=7-1.7=0.88+0.01=6.4-0.3=
8.5+0.5=8.4+1.2=0.66-0.15=6+0.1=
二、混合运算。
0.71-0.36+1.96.5-0.39-4.6157.2+37.9+10.3
67.44-46.37+29.2772.86+44.5+59.337.38+1.32-3.15
50-(6.28+0.83)72.8+(13.1-8.8)9.42+6+3.39
一、口算。
7.9+0.3=6.9-3.1=0.68+0.29=6.1-0.3=
2.7+0.2=8.5-3.8=0.89-0.09=5.2-0.8=
2.9+0.2=8.4+0.2=0.74-0.14=2.7-0.8=
4+0.8=8.5+0.8=0.78-0.32=5.7-0.1=
6.1+0.5=8.4+4.2=0.79-0.23=1.9+0.6=
4.2+0.6=6.2+1.9=0.77+0.05=3.2-0.6=
2.5+0.1=7.2+4.3=0.69-0.13=7.6-0.7=
3.5+0.9=6.1-2.4=0.66+0.16=7.1+0.7=
二、混合运算。
0.9+0.05+3.55.8-0.4-0.672.3-34.8+36.5
87.07+38.78+27.286.33-20.62+25.214.1-1.22+1.16
30-(5-0.19)85.6-(16.9+5.6)6.34+1.59-1.16
一、口算。
8.4+0.8=8.2+0.6=0.82+0.11=7.3+0.5=
7.4+0.6=8.9-2.6=0.82+0.31=5+0.3=
4.4+0.5=8.9+0.5=0.85-0.28=3.8-0.2=
9-0.9=6.5+2.4=0.6+0.32=2.8-0.8=
4.4-0.8=6+1.4=0.89-0.28=3.9-0.1=
4.4-0.6=6.6-3.6=0.72-0.13=1+0.6=
8.8-0.7=6.3+2.5=0.7-0.25=3.3+0.6=
4.6-0.6=6.4-2.9=0.6+0.05=1.7-0.7=
二、混合运算。
0.8+0.47+5.58.8-0.8-0.267.4-47.6-11
74.08-48.83+93.1689.92+15.31+96.315.13-3.39+1.48
80-(2.02-0.43)75.1-(19.1+2)9.24-1.88+1.01
一、口算。
2.3+0.1=7.2+3.8=0.61-0.35=7.3-0.5=
7.3-0.1=7.6-0.8=0.81+0.2=3.4-0.1=
8-0.5=7.2+0.6=0.66+0.32=1.5-0.9=
7.5+0.9=8+4=0.63+0.06=3-0.6=
5.6+0.7=8-3.6=0.69-0.2=1+0.2=
1.2-0.1=8.6-1.5=0.7+0.2=8-0.3=
8.5-0.3=7.7-4.6=0.62+0.1=3.4+0.6=
5.5+0.8=7.4-3.8=0.75+0.25=7.4+0.1=
二、混合运算。
0.74-0.34+7.19.8-0.84-2.1644.8+11.9-14.6
69.06-32.9+96.3171.78-30.29+34.566.26-2.65+2.32
20-(5.67+0.26)78.6+(10.1+3.2)5.5-1.88+1.54
一、口算。
4.7-0.9=6.8-2.5=0.85+0.4=3.5+0.4=
2.3-0.6=9+1.1=0.75+0.33=3.7-0.1=
1.4+0.9=7+1.4=0.63+0.45=5.3+0.2=
7+0.1=7.8-2.8=0.86-0.48=4+0.9=
5.3-0.2=7.6+3.8=0.83+0.38=6.1-0.8=
1.7-0.3=7-0.3=0.61+0.03=1.5-0.7=
6.1+0.9=8.7+3.9=0.87+0.2=6.3+0.8=
1.1-0.9=8.2-4.2=0.77-0.49=4.3-0.6=
二、混合运算。
0.86-0.4+69-0.66-3.3463.3-22.8-16.4
65.95-13.94+56.8267.55+43.47+79.825.38-2.71+2.26
70-(2.89+0.59)63-(27-6.1)8.12-2.91-4.77
一、口算。
5.1-0.4=6.6-2.7=0.6+0.05=7.8-0.9=
4.5-0.4=8.2+2.3=0.9+0.25=6.4-0.5=
3.8+0.2=8-1.5=0.66+0.17=1.7+0.2=
7.8-0.7=6.4+3.9=0.88+0.35=2.7+0.6=
4.4-0.4=6.8-3.7=0.9-0.49=3.4+0.8=
3.4+0.3=8.5+3.4=0.8+0.08=8.9+0.9=
6.3+0.4=7.4-1.9=0.85-0.14=1.5+0.1=
6.2+0.6=6.9+3.8=0.8+0.07=6.4-0.4=
二、混合运算。
0.7+0.08+1.18.9-0.1-3.965.2-27.8+21.5
81.4+17.48+79.9178.88+34.23+74.059.14-3.79-3.4
70-(5.2-0.27)74.4-(19.7+7.7)8.31+3.47-4.06
一、口算。
5.4-0.6=8.4-1.1=0.8+0.2=2.1+0.5=
5.1+0.3=8.2+4.2=0.63-0.37=2.1-0.6=
2.7-0.4=8.4-2.9=0.89-0.25=4.4-0.9=
3.2-0.4=7.3-1.4=0.8+0.23=4-0.4=
3.8+0.6=8.6+3.6=0.68+0.08=7.6-0.5=
7.4-0.5=6.4-2.5=0.78-0.06=6.2+0.1=
5.2-0.5=6.8-2.4=0.68+0.32=5.4-0.4=
5.1+0.6=8.6-0.2=0.68+0.21=6.6+0.3=
二、混合运算。
0.82+0.28+8.75.8-0.85-1.1567.6+17.6-38.5
87.09+37.56+86.0265.45-35.62+94.694.24-2.63+1.33
50-(8.1+0.55)81.8+(23.2-6.8)4.61+3.08+1.08
一、口算。
5.7-0.4=8.6+4.7=0.79-0.48=2.8-0.7=
6.2-0.8=6.6+4.1=0.75+0.21=4.8+0.8=
7.2+0.3=8-3=0.81-0.19=6.5+0.4=
5.7-0.2=6-0.9=0.62-0.47=3.4-0.1=
6.3-0.6=6.3-3=0.73-0.22=4.1+0.3=
2.6-0.6=7.6-4.2=0.87-0.16=8.5+0.4=
6.7+0.6=6.3+3.3=0.7-0.09=7.5+0.7=
8.7-0.1=6.4-4.3=0.81-0.49=7.7+0.8=
二、混合运算。
0.87-0.21+6.99.6-0.28-1.7256.5+21.7+16.4
82.96-30.47+23.1475.49-14.45+52.35.26-1.66+3.56
80-(5.56+0.46)77.3-(15.3-8.2)9.25-3.03+2.48
一、口算。
1-0.4=7.1-0.7=0.81-0.24=4.1+0.8=
6.4+0.6=8.4-3.9=0.81+0.11=1.7-0.1=
2.5-0.7=6.8-1.3=0.82+0.48=4-0.6=
4.2-0.2=6.2-3.5=0.88-0.24=7.8+0.5=
3.7+0.4=7.4+0.6=0.71-0.18=6.1+0.3=
7.4+0.7=9-0.4=0.69-0.19=6+0.8=
1.3+0.5=6.7-4.1=0.9-0.11=4.4+0.2=
4.9+0.6=8.8+2.6=0.85-0.02=6.8+0.3=
二、混合运算。
0.87+0.48+5.97.6-0.33-0.6746.6+27-12.2
78.83-11.99+55.272.82+25.22+99.416.68+1.38-4.98
90-(8.74+0.59)74.6-(13.8-7.6)6.82-2.67+2.26
一、口算。
4.1-0.8=9+3.3=0.68-0.44=1.4+0.1=
7.6+0.2=7.9-0.7=0.87-0.46=2.5+0.1=
7.1+0.9=8.5+0.8=0.69+0.07=6+0.2=
6.1-0.1=8.6+1.7=0.71+0.49=1.4-0.4=
2.1+0.7=8.2-2.2=0.75+0.11=6.5+0.1=
8.2-0.4=7.5-4.5=0.89-0.17=5.6+0.5=
6.1+0.8=8.7-1.1=0.9+0.46=2.3+0.1=
7.3-0.8=8.4+1.4=0.64-0.34=1.1+0.5=
二、混合运算。
0.67+0.01+3.85.5-0.63-2.3786.3+60.8-20.4
71.27-47.79+23.5564.82+37.24+84.288.28+4.01+1.16
90-(7.96-0.72)88.9+(27-3)4.56+2.75+1.1
一、口算。
3.5+0.1=6.6-2=0.74+0.18=3.3-0.2=
4.4+0.1=7.8+1.6=0.7-0.13=5-0.7=
7.4+0.4=6.2+4.1=0.9+0.37=5-0.6=
3.3-0.6=8.7+2.6=0.73-0.35=4.5-0.7=
7.4-0.3=7.4-1.1=0.6-0.42=6.4-0.9=
8.5-0.5=8.4-4.1=0.9+0.03=2-0.4=
5.6-0.7=6.2+4.2=0.66+0.22=5.9+0.9=
5.8+0.5=7.1+3.5=0.64-0.02=6.8+0.6=
二、混合运算。
0.66-0.42+0.49.6-0.43-4.5735.6-10.5-20.3
70.91-35.58+84.7370.15-15.3+19.658.38+1.1+7.28
70-(1.71-0.98)93.1+(14.4-9.9)6.97+2.22+1.23
一、口算。
5.2-0.9=8.2+2.7=0.84+0.45=6.1+0.5=
9-0.8=6.3+3.4=0.67-0.11=6.5-0.4=
6.4-0.7=8.2-2.1=0.75+0.24=1+0.4=
2.3-0.8=9+4=0.74-0.39=8.7+0.3=
3-0.1=6.4-1.2=0.66+0.31=4.9+0.7=
2.4+0.4=6.7-1.7=0.67-0.41=7.1-0.7=
2.9+0.9=8.2+4.1=0.61-0.06=7+0.1=
1.8-0.9=9-2.5=0.73-0.11=2.4-0.6=
二、混合运算。
0.6+0.03+7.59.7-0.12-2.8894.2-56.8+37.1
61.93+21.05+72.0874.44-23.39+69.927.74-1.6+4.6
90-(7.01-0.87)82.9-(12.4-9)7.28+1.45+5.5
一、口算。
4.6-0.4=6.7-1.7=0.86-0.34=3.7+0.5=
4.8-0.5=8.8+2.8=0.62+0.3=5.6-0.6=
8-0.1=8.4-4.1=0.62+0.12=5.5+0.5=
5.9+0.3=7.4+4.2=0.71-0.27=8.8+0.6=
4.1-0.7=6.8+3.8=0.62+0.29=8.1-0.5=
2.1+0.3=8.1-4.8=0.7-0.17=8.6+0.3=
4.6+0.9=7.5-1.6=0.65+0.17=6.2-0.9=
8.1+0.7=8.2-1.3=0.66-0.39=1+0.5=
二、混合运算。
0.88+0.21+9.49.6-0.27-1.7357.5+16.9+28.3
66.9-29.06+57.9470.15-14.54+85.653.72+2.09-1.41
50-(9.47+0.25)82.3+(10.8+5.2)7.86+5.06-1.56
一、口算。
7.5-0.6=9+3=0.82-0.15=7.8-0.4=
4.8-0.6=7.9-0.5=0.8+0.05=5.7-0.9=
7.7-0.8=6.1+2.1=0.78-0.26=4.5-0.1=
7.4+0.3=8.7+2.6=0.7+0.18=7.7-0.3=
6.6-0.9=7.2+1.1=0.79-0.32=3.3+0.2=
8-0.2=7.8+3.7=0.84+0.33=7.4-0.1=
5.4+0.1=8.7-2.3=0.65-0.21=4.5-0.6=
7.4-0.3=6.6+1.2=0.71+0.07=3.8+0.1=
二、混合运算。
0.87+0.32+4.46.3-0.26-2.7438.2+10.1-18.3
78.43+22.07+32.7980.35-16.66+11.024.6-2-2.49
50-(7.12-0.76)92.8+(29.4-8.3)4.39+1.04-2.71
一、口算。
7-0.8=7.2-0.4=0.74-0.3=3.6+0.7=
1.6-0.9=8.7+3.7=0.62-0.49=6.9+0.7=
6.1+0.4=8.8-2.5=0.76-0.12=5+0.3=
4-0.8=7.9+4.9=0.89-0.04=5.5-0.9=
1.9-0.6=6.6+2.3=0.61-0.06=3.6+0.5=
8-0.2=6-2.8=0.85-0.2=1.5-0.7=
6.3-0.4=7.6+1.7=0.66-0.36=8.5-0.4=
7.1+0.7=8+4.1=0.72-0.35=5.1-0.9=
二、混合运算。
0.61-0.22+3.66.1-0.4-4.680.8-40.7-16.4
67.1+23.24+6960.65-14.83+46.635.63+1.67+3.04
40-(8.63+0.73)95.8+(26.4+1.1)5.04-1.01-1.67
一、口算。
6.8-0.9=6.8-2.4=0.79+0.42=2.8-0.6=
1.5-0.8=6.8+1=0.89+0.29=5.6-0.9=
7.5-0.2=7.1-0.6=0.77+0.05=2.2-0.5=
2.9+0.7=7.3+2.2=0.61+0.35=1+0.9=
6.3-0.4=8.7-1.9=0.78+0.34=3.7+0.4=
8.6+0.5=8.9-4.6=0.89-0.13=1.1-0.1=
8.4-0.8=7.2-1=0.6-0.08=3.1+0.3=
2.7+0.8=6.7-3.6=0.66-0.41=4.1+0.1=
二、混合运算。
0.79-0.29+3.67.8-0.22-1.7880.3+42.8+17.7
68.76+15.56+54.6464.41+16.51+58.367.33-5.64+1.14
30-(8.08-0.38)83.1-(13-8.5)9.62-1.01-8.21
一、口算。
5.3+0.9=6.4+4.7=0.62+0.42=7.7+0.2=
2+0.9=7.3-3.9=0.83+0.32=5.6+0.9=
3.2+0.3=6-4.4=0.75-0.07=6.3+0.6=
6.3-0.8=8.5-4.7=0.72+0.17=3.9+0.6=
3.6-0.8=8.4-2.5=0.72-0.09=2.2-0.6=
5.8+0.4=6.2+3.7=0.88-0.16=3.2+0.9=
8.3+0.8=7.3-0.1=0.75-0.26=7.9-0.7=
4.6-0.2=7.6+2.4=0.88-0.05=6.5+0.2=
二、混合运算。
0.83-0.03+5.37.9-0.34-4.6658.5-11.9-31.2
73.76+32.26+88.7288.88+48.51+86.954.6-2.67+1.41
70-(4.65-0.1)60.8+(29.1+8.1)9.3-5.57+2.5
一、口算。
3+0.9=7.1+3.3=0.73-0.26=7.8-0.1=
3.7+0.6=8.3+0.5=0.73-0.3=5.3+0.9=
8.2+0.6=8.2-2=0.86+0.01=8.5+0.4=
8.4-0.6=