四年级数学下册小数加减法混合运算专项练习50.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50.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50
一、口算。
2.1+0.4=6.7-4.9=0.73-0.37=5.2-0.9=
1.2-0.9=8.3-1=0.64+0.38=8.6+0.5=
7+0.8=7.7+3.5=0.6-0.21=2.9+0.2=
1+0.6=8.6-3.6=0.81+0.35=7-0.7=
8.1-0.3=7.2+4.2=0.6-0.31=8.2+0.6=
7.4+0.5=8.4+4.7=0.61-0.23=6.7+0.9=
4.9-0.6=8.3+1.1=0.64+0.39=4.9+0.2=
7.2+0.4=7.5-1.4=0.68-0.39=5.5+0.8=
二、混合运算。
0.64-0.39+7.97.5-0.89-2.1191.6+23.9-31.5
82.21+40.75+41.0275.22-33.44+35.066.74+2.27+1.37
50-(4.15-0.58)92.8+(18-9.7)6.23-2.03+1.78
一、口算。
5.4+0.7=6.7-1.8=0.87-0.11=5.1-0.2=
8.6+0.9=7.4+1.6=0.76+0.32=2.6-0.1=
8-0.2=6.5-3.3=0.62-0.27=5.4+0.4=
7.8+0.2=6.2-3.1=0.71+0.44=8.2-0.1=
1.7+0.1=6.3+3.3=0.8-0.36=8-0.1=
2-0.9=7.8+0.8=0.73-0.11=6.6-0.2=
6.2-0.1=6-4.1=0.7-0.01=8.4+0.5=
3.8-0.3=7.3+1.9=0.64+0.21=5-0.3=
二、混合运算。
0.89+0.22+6.69.2-0.1-2.958.9-17.7+21.5
66.91+20.86+25.6264.35+36.41+88.955.51-1.13+1.21
70-(8.01+0.98)74.9-(11.4+3.9)5.9+3.73+1.94
一、口算。
7.9+0.1=6.4+2.1=0.67+0.4=5.3-0.8=
4-0.4=6+2.4=0.71+0.19=4.9+0.4=
6.8+0.8=8.9+1.8=0.72+0.04=8.6+0.6=
5.9-0.9=6.1+3.9=0.86+0.03=4.6-0.6=
6.9-0.3=7.2+4.3=0.67+0.39=4.3-0.4=
5.6-0.6=8.5-3.2=0.61+0.14=7-0.7=
5.9-0.9=8.2+2=0.77-0.31=3.7+0.7=
1.2+0.9=8.1+3.5=0.88-0.16=7.4-0.6=
二、混合运算。
0.63+0.06+0.57.3-0.66-2.3474.8-36.2-27.7
61.47+43.65+31.3888.27+37.79+21.066.89-3.45-1.26
90-(1.44+0.29)91.7-(18.1+9.6)5.81+3.68+1.07
一、口算。
8.9-0.2=8.5-4.3=0.82-0.15=7.4+0.5=
3.6-0.6=8+1.3=0.8-0.06=6.3+0.6=
5-0.2=6.7+4.5=0.73+0.31=2.8-0.9=
8.2-0.2=6.1-2.5=0.6+0.25=8.9-0.5=
5.6-0.1=7.9+0.3=0.72-0.25=6.6-0.3=
1.2+0.2=6.2+3=0.81-0.24=8.2-0.9=
8.3+0.2=6.5-0.5=0.62+0.29=6.4-0.2=
5.5+0.4=6.1-0.7=0.82+0.22=1+0.7=
二、混合运算。
0.82-0.12+1.59.2-0.86-1.1454+34.2-18.9
75.16-15.5+17.5887.22-23.26+14.974.37-2.38+1.89
80-(2.78+0.43)68.4-(27-2.9)5.89-2.89+1.01
一、口算。
5.3+0.1=6.8-1.2=0.74-0.21=6.7-0.1=
1-0.6=6.2+3.2=0.7-0.21=4.4+0.8=
6.2+0.3=7.1+0.4=0.87+0.15=2.6-0.3=
7-0.9=8.2+2.3=0.63+0.4=5.1+0.7=
2.2+0.6=7.5-2.7=0.6+0.25=1.7+0.5=
2-0.6=6.9-4=0.9-0.11=4.8-0.3=
6.5-0.3=6.1+1.6=0.68+0.07=7.4+0.2=
1.1+0.2=6.6-0.5=0.74+0.42=4.5-0.4=
二、混合运算。
0.82+0.17+6.15.5-0.19-0.8178.6-55.1+22.3
63.76-15.11+65.4365.09-20.38+46.889.17-7.63-1.38
90-(4.65-0.56)63.7-(17.1+1.3)5.54+2.11+2.42
一、口算。
3.6-0.7=7-4.2=0.65+0.47=2-0.7=
1.2+0.3=8.7-0.4=0.68-0.02=3.1+0.4=
6.2-0.5=6.4+3.5=0.63+0.33=3.8-0.5=
8.2-0.8=8.9-3.8=0.77-0.17=7.6+0.8=
1.1-0.1=8.5+1.8=0.84-0.31=7.1+0.3=
1.3+0.3=7.7-0.5=0.67-0.13=1.1-0.3=
4.7+0.6=6.8-2.3=0.8-0.16=3.8+0.5=
7.3-0.2=6.1-4=0.65-0.05=4.4+0.2=
二、混合运算。
0.9-0.4+8.87.6-0.75-2.2585.8-57.9+25.6
60.87+32.14+71.7267.74-35.26+53.988.86+6.79-1.88
20-(4.87-0.31)98.1-(20.1+1)5.55+3.2+1.15
一、口算。
8.2-0.1=7.8+1.1=0.81-0.07=8+0.8=
7.5-0.9=8.8-3.1=0.74-0.3=1.2-0.6=
7.8+0.6=7.9+4.7=0.88-0.04=5+0.9=
2.7+0.8=6.6-1.8=0.86+0.4=4.3-0.2=
4.2+0.7=7.2-0.1=0.71-0.31=5+0.2=
3.3+0.3=8+3.7=0.75+0.18=7.4-0.8=
6.5-0.8=6.1-1.2=0.9-0.2=8-0.4=
8.2+0.1=7.3+4.7=0.6+0.49=7.8-0.5=
二、混合运算。
0.75+0.32+4.75.1-0.2-2.882.3-30.7-48.8
85.86-20.79+25.7670.01-23.18+14.868.41-1.37-6.28
70-(3.28-0.66)88+(14.5-7.5)9.59+3.35+5.11
一、口算。
6.4-0.8=6.1-2.3=0.87+0.11=4.1+0.3=
7.7+0.4=7.8-3.4=0.73+0.14=8+0.3=
5.2+0.7=6.8+4.6=0.83-0.33=8.6+0.5=
2.6-0.7=6.6+3.7=0.66+0.01=7.3-0.3=
1.5+0.2=6.9-2.8=0.72+0.24=2.3-0.6=
6.2+0.9=6.7+4.4=0.85-0.14=2.4-0.1=
3.1+0.3=8.8+1.2=0.86+0.3=8.1-0.7=
7.7+0.3=7.6-0.2=0.74+0.23=3.2-0.5=
二、混合运算。
0.69-0.3+8.76.5-0.3-2.752.7+29-18.5
79.26-40.11+30.8275.86+12.73+59.528.35+1.87-4.68
70-(5.64+0.53)84.1+(17-5.1)4.67+3-1.56
一、口算。
8.6-0.7=6.4-0.7=0.66-0.39=5.6+0.8=
8.5+0.2=7.2-3.9=0.63+0.14=1.1-0.7=
9+0.3=8.5+2.8=0.9+0.25=6.8+0.6=
5-0.2=6.3+1=0.66-0.34=5.4-0.5=
3.1-0.7=6.5+2.7=0.85+0.09=6.9-0.1=
4-0.4=8.1+2=0.89-0.27=5.8+0.5=
5.6+0.9=6.2-1.6=0.67+0.29=1.8+0.7=
1.4+0.8=7.9+0.1=0.74-0.29=3.2-0.2=
二、混合运算。
0.7+0.19+6.57.3-0.77-2.2355.7-24.7+11.5
70.18+18.76+86.1876.6-25.77+21.347.98+4.69+2.31
20-(6.11+0.23)97.8-(21.6+8.1)6.59-2.89-3.32
一、口算。
6.5+0.2=6.5+4.7=0.66+0.2=7+0.8=
4.4-0.1=6+2.7=0.72+0.18=7.6+0.8=
1.5+0.7=8+2.2=0.62+0.34=7.1+0.7=
8.7-0.4=7.2+4.2=0.64-0.12=6.7-0.9=
2.3-0.1=6.8+2.3=0.9-0.32=8+0.7=
5.4-0.8=7.1-3.7=0.6+0.39=3.2+0.6=
2.5-0.9=8.7+2.1=0.82+0.3=3+0.9=
8.5+0.3=8.3-3=0.75+0.08=4.3-0.6=
二、混合运算。
0.66+0.06+7.15.5-0.35-0.6582.5-13.2+38.8
61.84+17.78+21.7474.54-14.59+23.63.52+1.92-1.19
30-(2.77+0.49)97.6+(16.5-6.5)5.51+1.63+2.17
一、口算。
8.1+0.7=6.8-2.4=0.89+0.02=1.4+0.8=
3.7+0.7=7.3+1.5=0.8-0.26=2.6-0.6=
6.2-0.5=8.2-1.4=0.89+0.18=6.2+0.5=
7.8+0.3=8.5+0.1=0.7-0.41=1.9-0.6=
4.6-0.4=8.7-2.3=0.78+0.37=5.3+0.5=
3.9-0.5=6.5+4.9=0.6+0.17=6.3+0.8=
2.8+0.7=6+2.1=0.87-0.05=6.1+0.9=
1.7+0.4=6.4+0.9=0.76+0.17=5.4+0.1=
二、混合运算。
0.69-0.01+7.45.9-0.18-4.8274.9-44.4-27.2
72.55-35.18+82.9289.74-48.49+16.467.38-3.49-3.73
30-(2.86-0.44)90.4+(22.4-3.1)3.83+1.89+1.87
一、口算。
7.8+0.6=6.2-4.9=0.83-0.43=4.7+0.7=
4.1+0.6=7.1-2.7=0.83+0.05=1.7+0.8=
6.5+0.6=6.2+4.2=0.6-0.48=1.2-0.2=
1+0.7=6.8+1=0.61+0.49=6.6-0.5=
3.9+0.8=7.4-0.6=0.8+0.03=3.7+0.7=
2.7+0.7=8.3-4.5=0.87+0.18=2.3+0.3=
6.2+0.8=6.6-2.8=0.72+0.21=7.2-0.7=
1.4+0.6=8.2-3.8=0.69-0.36=4.3-0.5=
二、混合运算。
0.64-0.19+9.86.8-0.86-1.1438.3+16.6-10.9
70.17-43.18+53.1283.34+45.64+12.087.77-3.55-1.38
40-(6.64-0.25)92.4-(21.7-6.4)4.83+1.12-1.85
一、口算。
6.7-0.9=6.6-4.8=0.8-0.27=1.9-0.4=
5.8-0.3=8-3.2=0.6-0.25=4.2-0.3=
2.9-0.1=7.1-1.9=0.66-0.41=6.8+0.8=
6.7-0.8=7.7-1.1=0.68+0.49=1.6+0.4=
6.6+0.6=6+3.3=0.67-0.27=4.7-0.5=
8.3-0.3=7.2-2.5=0.6-0.18=5.2+0.8=
3.3+0.8=8.9+1.9=0.89+0.29=6.2+0.8=
3.9+0.2=6.1-0.6=0.78-0.09=8.9+0.2=
二、混合运算。
0.77+0.47+0.89.2-0.63-1.3797.4-11.2-74.4
75.55-34.33+14.5161.26-29.27+42.699.73-4.12+4.08
50-(5.29+0.12)86.4-(13.3+8.8)4.41+2.59+1.12
一、口算。
5.3+0.3=8.1+1.9=0.85-0.4=5.2-0.8=
1.3-0.5=7.8+0.2=0.61-0.01=5.8-0.2=
8.3-0.8=7-4.2=0.88-0.12=5.6-0.6=
3.7+0.6=8.1+1.5=0.83-0.43=3.2-0.7=
6.9+0.7=6.4-2.2=0.6-0.22=5.3-0.3=
3.9+0.2=7.2+0.9=0.77-0.46=4.7+0.9=
5+0.5=7.6-2=0.81+0.03=3.2+0.4=
6.6+0.6=8.6+2.3=0.73+0.09=4.7+0.2=
二、混合运算。
0.64-0.32+6.49.1-0.55-4.4537.9+13.5+23.4
65.07-42.28+49.0369.21+10.24+62.266.41-4.89-1.18
90-(7.92+0.25)76.8-(15.8+8.1)5.99+1.33+2.77
一、口算。
4+0.9=7.6+4.6=0.76+0.26=1.1-0.8=
2.6-0.4=8.9+3.3=0.79-0.33=8.8-0.4=
1.7+0.3=6.9+0.5=0.74+0.03=1.7+0.2=
3.1-0.6=7.6+4.9=0.79-0.41=2.4-0.1=
3.8+0.1=6.7-3.1=0.79-0.28=2.1+0.6=
4.8+0.4=6.2+1.9=0.71-0.05=4-0.4=
5-0.9=6.8+1.7=0.66-0.08=8.8+0.3=
7.9+0.8=7.8-3.7=0.68-0.14=1.5+0.1=
二、混合运算。
0.85+0.43+3.15.3-0.59-0.4182-59.3-16
63.45+24.09+27.564.84-19.63+87.284.52-1.06-2.15
50-(4.95-0.96)68.6-(11.8-7.3)3.95-1.36+1.8
一、口算。
8.3-0.3=6.4-1.2=0.88-0.49=8.7+0.7=
4.5+0.1=8.2+1.6=0.86-0.36=5.5+0.5=
1.7+0.3=9-2.2=0.68+0.44=5.5+0.5=
3.3+0.8=8.1-4.5=0.83+0.36=3.4-0.4=
8.4-0.3=7.9-0.9=0.61-0.36=5-0.3=
3.9+0.1=7.6+2.2=0.65-0.49=1.3-0.8=
1.1-0.2=7.6-2.5=0.68+0.2=7.7+0.2=
5.1+0.5=6.7-1.4=0.83+0.37=3.4-0.9=
二、混合运算。
0.81+0.26+25.2-0.28-0.7252.5+14.4+28.4
71.79-26.32+71.371.53+17.51+82.496.8+4.93+1.05
70-(7.01+0.2)82.6-(19.4-3.1)4.04+2.29+1.48
一、口算。
3.4-0.6=7.7+0.5=0.88-0.47=7+0.8=
5.5+0.9=6.1-4.8=0.86+0.19=2.5+0.4=
5.8+0.5=6.2+2.2=0.84+0.24=7.9+0.5=
7.5-0.3=8-3.1=0.77-0.15=6.9-0.5=
4.7-0.8=7.5+0.5=0.78+0.12=8.7+0.4=
2.1-0.1=7.1-2.5=0.86-0.48=2.8+0.6=
5.9+0.3=6.4-0.8=0.86-0.4=3.5+0.2=
1.2+0.7=8.3+2=0.66+0.48=2-0.6=
二、混合运算。
0.75+0.31+9.95.2-0.52-4.4860.2-14.7+14.7
67.66-30.46+41.2664.99-39.77+997.35+3.38+3.95
70-(7.14-0.12)86.4+(21.3+4.9)7.89+2.46+1.54
一、口算。
1.9-0.4=9+2.4=0.7+0.19=1.5-0.2=
2+0.9=7.4-1.8=0.77-0.24=4.5-0.5=
4.8+0.2=6-2.5=0.86+
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