四年级数学下册小数加减法混合运算专项练习42.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42.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42
一、口算。
8.4+0.3=8.9+1.1=0.63-0.06=2.4-0.7=
2.1-0.9=7.8+3.2=0.76-0.22=3.9+0.1=
1.4+0.9=7+4.9=0.7+0.49=8.5-0.4=
7.6+0.3=8.7-1=0.71-0.11=3.4-0.8=
8.4-0.1=6.2-0.7=0.86+0.44=5-0.5=
3.9-0.7=6.7+4.7=0.77+0.28=2.2-0.3=
7.8-0.1=8.3+0.5=0.63-0.17=5.1-0.3=
5.6+0.6=8.2-4.8=0.64+0.05=1.8-0.2=
二、混合运算。
0.82+0.24+7.68.5-0.29-0.7138+22.4+10.6
80.76+26.69+68.5869.33+42.02+49.684.35+2.55+1.27
60-(2.99+0.15)88.9-(14-8.2)5.36+3.13+2.17
一、口算。
5-0.4=8.5-2.5=0.72+0.4=8.3+0.7=
7.3+0.6=7.4+4.4=0.63+0.03=3.6-0.7=
7.8-0.5=6.7+0.9=0.82+0.04=3.2-0.5=
1.8-0.8=8.4-3.3=0.88-0.2=7.9+0.8=
6.8-0.2=8.7+0.7=0.73-0.05=4.1+0.6=
1.1+0.6=7.8-1.9=0.79+0.16=1.4+0.9=
5.6-0.6=7.2-1.9=0.83-0.07=5.2-0.2=
5-0.7=6.7-3.7=0.85+0.31=7.3+0.3=
二、混合运算。
0.75-0.28+4.19-0.75-1.2570.3+34.1+18.6
78.61-42.49+11.888.56+42.92+25.459.4+5.23-2.06
40-(1.57-0.73)87.3+(23.2+8.3)6.84+1.06-5.54
一、口算。
1.7+0.6=8.2-3.5=0.81+0.37=4.2+0.3=
2.9+0.4=7.7-4.1=0.77-0.23=4.2-0.1=
7.3-0.2=6.7-3.5=0.81+0.17=6.2+0.3=
2.6-0.3=8.8-1.3=0.65+0.22=1.8-0.3=
3.7-0.7=8.1-2.1=0.82+0.13=7.4-0.4=
8-0.4=7.7+4.1=0.87+0.16=3.3-0.6=
8.1-0.6=7.6+0.6=0.62+0.11=6+0.7=
4.2-0.1=8-0.5=0.75+0.07=6.8+0.5=
二、混合运算。
0.88+0.12+56.2-0.38-3.6252.1+15.6-31.6
80.59+37.71+47.6485+22.29+49.115.12-2.66+1.77
20-(4.56-0.56)65.1+(21.8-8.9)4.2-1.73+1.55
一、口算。
7.9+0.3=7.5-2.5=0.72-0.24=3.2+0.2=
8.1+0.6=8.9+0.2=0.78-0.19=8.1-0.7=
2.1-0.5=8.4+1.2=0.88+0.31=1.6-0.7=
3.3+0.5=7.7+2.4=0.88-0.49=7.6-0.7=
4.3+0.7=6.3+1.5=0.74+0.19=2.6-0.9=
5.3-0.3=8.4+3=0.74+0.3=7.5-0.7=
3.7-0.4=7.5-0.4=0.69-0.29=6.7-0.9=
6.4-0.2=7.9+3.3=0.6-0.03=4-0.8=
二、混合运算。
0.78-0.27+2.27.2-0.88-4.1245.8-20.8-18.7
84.07+22.04+55.472.31+36.66+21.786.07-4.06+1.49
50-(4.2+0.91)69.7-(19.1-9.6)8.45-1.76-3.73
一、口算。
8.6-0.6=6.7+3.1=0.69+0.24=8.8+0.1=
6.3-0.5=7.5-1=0.75+0.24=7.9+0.7=
8.9+0.9=7-3.9=0.67+0.33=4.2-0.6=
8.8-0.1=8+1.1=0.71+0.02=2.8-0.1=
6+0.5=8.7-4.8=0.66-0.06=4.5-0.7=
1.5+0.3=7.5+4.4=0.63-0.38=6.4+0.3=
4.8+0.7=7.2+0.1=0.62+0.26=5.2-0.3=
3.2+0.2=6.7-2.3=0.69-0.32=6.4-0.8=
二、混合运算。
0.81+0.19+6.88.4-0.31-4.6983.8+30.8+31.7
73.14-31.16+65.3788.8+47.48+88.947.9+2.77+4.16
90-(9.75+0.93)79.2+(27.8-5.1)9.42-5.63+3.77
一、口算。
8.6+0.8=8.5+0.7=0.71+0.06=8.7+0.6=
7.4-0.3=8.3-0.5=0.71+0.29=1.7+0.9=
3.2+0.5=8.3+4.3=0.86-0.24=1.6-0.9=
5.4+0.1=7.3-4.2=0.69+0.26=6.1-0.9=
1.4-0.5=8.8-0.5=0.72+0.44=7.5+0.7=
4.1+0.4=6.6+3.8=0.69+0.28=6.3+0.9=
2.7+0.2=8.1-2=0.64+0.11=8+0.5=
1-0.5=7.6+3.2=0.65+0.44=1.7-0.7=
二、混合运算。
0.78-0.2+6.45.7-0.36-3.6470.7+46.5+23.3
69.15+41.15+46.2465.98-25.02+46.325.63+1.96+2.65
70-(2.34+0.37)60.9+(22.6-4.3)3.9+1.46+2.36
一、口算。
3+0.5=6.5-2.9=0.71-0.46=3.7-0.7=
4.5+0.7=7.1+0.4=0.85-0.34=2.8+0.4=
3.5-0.6=7.1+4.7=0.64-0.38=5.9+0.8=
7.7+0.6=6.8+1.7=0.66+0.32=7.1+0.1=
2.6-0.4=7+1.3=0.7-0.44=5.8+0.2=
4+0.6=7.5-4.6=0.65+0.37=8.9-0.7=
8.1-0.5=6.5-1.3=0.79-0.42=5.8+0.9=
8+0.2=9+4.2=0.73-0.27=4-0.5=
二、混合运算。
0.6-0.48+0.75.3-0.65-0.3589.1-34.9-36.1
84.16+35.43+41.360.18-27.06+10.017.4-5.25+1.74
30-(2.7+0.3)96.7+(13-1.5)8.09-2.85+2.47
一、口算。
1.2+0.6=9+0.6=0.78+0.25=1.4-0.7=
7.1+0.9=6.1-3.3=0.67-0.04=3.7+0.2=
7.9-0.4=8.4-4=0.74+0.08=5.4+0.3=
4.6+0.3=8.7+1.8=0.75-0.22=4.3-0.5=
8.3-0.3=6.4-2.2=0.67-0.44=2.9-0.5=
3.3-0.4=8.4-3.9=0.75-0.25=5.2+0.6=
8.5-0.4=8+2.6=0.68-0.34=3.9+0.4=
1-0.5=7.8+3.1=0.61+0.14=4.3-0.7=
二、混合运算。
0.87-0.34+3.39.4-0.12-4.8838+11.5-19.3
70.54-16.67+52.7168.55-23.65+51.367.66-1.17-5.3
90-(8.59-0.1)73.9+(10.9-9.5)4.11-2.32-1.03
一、口算。
6.6-0.2=6.3-4.3=0.85-0.03=8.2-0.5=
1.5+0.3=8.9-3.6=0.63+0.47=3.1-0.5=
6.1+0.3=6.9-1.6=0.84+0.42=6.7+0.2=
7.8-0.9=8.7-2.7=0.65-0.3=8.4+0.7=
6+0.8=6.9+4.7=0.77+0.23=7.6-0.3=
3.9-0.7=7.8+2.1=0.6+0.2=1.6-0.8=
7.4+0.3=7.5-3.6=0.8-0.4=6.5+0.8=
8-0.9=7.4-0.8=0.6+0.15=4.6+0.9=
二、混合运算。
0.7+0.19+6.38.5-0.52-0.4852.4+13.7-38.1
60.58+24.71+27.6381.94-28.71+64.784.5+1.57-1.75
70-(4.72+0.57)97.5-(26.9-9.7)6.76+3.57-1.06
一、口算。
8.5-0.4=6.2+4.5=0.61-0.05=2.5+0.4=
4.3+0.7=6.5-3.2=0.88+0.25=1.4+0.9=
3.8+0.5=8.4+1=0.76-0.29=1.1+0.6=
8.9-0.3=7.2+1.1=0.77-0.4=1.2+0.2=
6.4+0.2=8.3-3.1=0.6+0.29=4.5+0.6=
4.8+0.1=8.2-3.6=0.6-0.32=6.2+0.8=
9+0.5=6.8-2.3=0.83-0.23=3.2+0.3=
4+0.7=7.7-0.4=0.89-0.44=3.9-0.3=
二、混合运算。
0.79+0.48+16.1-0.1-1.986.3-25.8+28.1
72.97-43.15+76.5279.91-43.48+36.36.94-3.91+1.61
40-(3.59+0.89)63.9-(24.6+2.1)9.74-5.3+1.37
一、口算。
4.7-0.7=6.1+1=0.63-0.27=3.4+0.1=
6.5-0.7=8.7+1.1=0.62+0.35=9-0.7=
2.2+0.2=7+4.9=0.69+0.05=1.3+0.5=
2.3+0.6=7+2.9=0.74-0.25=6.8-0.9=
1.1+0.6=8.2-4.9=0.75-0.26=8.1-0.8=
1.4-0.3=7.3-0.3=0.66-0.46=6.4+0.3=
3.5+0.3=6.9-4=0.74+0.42=5.7-0.8=
1.3-0.7=6+3.3=0.66-0.44=6.3-0.7=
二、混合运算。
0.74-0.02+9.97.5-0.33-0.6793+19.5-29.2
65.28+38.11+68.7777.72-41.03+21.258.5-6.32+1.94
40-(8.34-0.7)66.3+(14.6-5.2)7.03-2.23-2.5
一、口算。
6+0.8=6.8+1=0.68+0.31=8.8+0.3=
4.4+0.9=6.7-2.2=0.72-0.12=4.6-0.1=
1.9-0.9=8.7+3.3=0.8-0.21=1.9+0.9=
6.2-0.4=8.3+1.3=0.79+0.2=8+0.1=
3.8+0.1=8-4=0.77+0.06=3.8+0.4=
3.3+0.2=8.1+0.5=0.76-0.31=5.9-0.5=
7.2+0.7=8.3+4=0.77-0.31=3.6+0.2=
3.7-0.7=8.7+2.7=0.83+0.18=6.9-0.2=
二、混合运算。
0.65-0.04+2.15.4-0.35-2.6594.1+64.2-25.7
66.89-32.89+34.5483.54-14.02+89.184.14+1.45-2.52
90-(3.73-0.52)90.6+(24.8-5.8)5.87+1.44-3.16
一、口算。
8.8-0.4=8.8-2.2=0.85+0.4=5.2-0.9=
7.4-0.4=7.3+2.2=0.6-0.29=7.8+0.7=
2.5+0.4=7+1.6=0.81+0.24=1+0.4=
6.7+0.6=7.2-3.1=0.86-0.49=4.8+0.2=
9-0.8=8.7-2.4=0.82+0.41=2.3-0.6=
7.1-0.9=7+1.2=0.85+0.35=8.2-0.3=
3.3-0.6=7.9+4.5=0.66+0.03=9+0.9=
7.3-0.4=7.5+1.9=0.63-0.46=4.6-0.1=
二、混合运算。
0.83-0.44+75.8-0.56-0.4498.7-53.9-35.8
61.81-43.34+24.3461.56+25.78+70.057.57-4.29-2.46
70-(2.91-0.23)71.9+(20.3+2.7)5.3+2.19+1.67
一、口算。
3.9+0.8=8.1+3.8=0.65-0.14=3.8+0.1=
6.3+0.1=6+0.5=0.74-0.06=4.6-0.1=
7.5-0.7=6.4-3=0.87+0.06=3.6+0.2=
4.4-0.9=8.6+3.2=0.7-0.31=2.1-0.4=
4.8+0.9=6.4+2.6=0.87+0.07=8.9-0.3=
4.1-0.4=8.1-0.6=0.65-0.28=4.1+0.9=
7+0.5=7.2+2.3=0.64+0.31=8.8-0.2=
7.6+0.8=6.6-3.9=0.8-0.12=6.8+0.1=
二、混合运算。
0.8+0.34+5.98.2-0.74-3.2686.4-64.7-13.7
61.48-23.89+98.2577.44-14.86+64.78.17-6.44-1.65
70-(4.99+0.6)85.9-(18.2+8.4)3.77+2.01-1.16
一、口算。
6.9-0.3=7.3-0.7=0.68+0.24=8.7+0.6=
5.7+0.7=7.6-2.2=0.68-0.36=6.8+0.4=
7.2-0.5=7.3+1.2=0.78+0.11=3.7+0.5=
3.1+0.1=6-4.2=0.65-0.47=6.2+0.9=
5.5+0.6=8.7+1.2=0.61-0.3=1.2-0.3=
2.7+0.9=6.5+1.7=0.73+0.36=1.8+0.8=
1.3-0.7=6.3+3.2=0.75+0.42=4.8+0.2=
4.5-0.1=7.9+1.7=0.7-0.44=7.4+0.9=
二、混合运算。
0.85-0.36+1.56.5-0.57-1.4344-17.8-10.3
78.59-46.97+52.5165.74-28.84+58.368.5-1.78-5.11
50-(1.68+0.78)84.5-(12.9-2.7)4.53-2.29-1.61
一、口算。
4-0.1=7.4-1.2=0.87+0.21=9+0.8=
5.8-0.2=7.5+1.2=0.6-0.16=4+0.8=
4.2+0.9=7.8-3.3=0.71+0.34=1.2+0.6=
1.7-0.6=8.4+1.6=0.68+0.31=7.4+0.6=
5.3+0.2=7.7+0.6=0.72+0.44=7.3-0.2=
8.5+0.5=8+1.4=0.63-0.31=8.5+0.5=
1.5-0.8=7.5+2.7=0.81-0.29=4.9+0.5=
7.4-0.9=7.8+2.1=0.9-0.22=5.1-0.8=
二、混合运算。
0.68-0.04+3.36.5-0.88-4.1244.1+25.7+16.8
69.98+28.5+99.4266+32.78+88.635.29-3.57-1.14
20-(1.95+0.96)63.4-(25.5+1.9)9.07-3.74+4.36
一、口算。
7.8-0.4=6.9+2.3=0.86-0.15=7.9+0.4=
3.5-0.7=7.5+3.3=0.76-0.42=2.8+0.1=
5.2+0.7=7.8-1.4=0.78-0.42=3.3+0.2=
8.4+0.4=8.4-0.5=0.85-0.05=5.7-0.1=
7.3+0.2=6.9+2.5=0.71+0.09=4.3+0.5=
3.7+0.2=7.7-4.5=0.85-0.36=5.2-0.8=
7.5-0.4=8.2-4.4=0.8-0.47=8-0.5=
3.1+0.3=6.4-2.6=0.81-0.34=7.1+0.2=
二、混合运算。
0.61+0.14+8.46.9-0.62-1.3873.6+17.1+29.3
72.54+34.25+20.4980.34+21.05+63.066.47-2.47-3.61
20-(3+0.26)61.2-(19-3.5)5.48-2.07+2.96
一、口算。
7.8-0.4=7-3.8=0.79+0.48=6-0.6=
6+0.3=7+4.3=0.82-0.08=6.6-0.6=
5.9-0.3=7-4.6=0.82-0.37=3.
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