四年级数学下册小数加减法混合运算专项练习20.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20
一、口算。
2.9-0.2=7.1-1.8=0.65+0.35=2.7+0.2=
7.3-0.6=7.8-3.7=0.87+0.2=8.6+0.1=
6.6+0.4=6.8-4.3=0.63+0.01=2.9+0.5=
1.7-0.2=6.2-4.3=0.88-0.33=1+0.7=
2.2+0.5=8.2-0.9=0.77+0.43=8.8+0.5=
4.5+0.3=8.6-4.4=0.61-0.02=1.1+0.2=
6.2+0.3=6.5-3.7=0.63+0.31=7.8-0.3=
9+0.9=6.9-3.5=0.71+0.17=8.5-0.9=
二、混合运算。
0.9+0.02+9.86.1-0.11-1.8983.8+23.6+20.1
68.6+39.85+80.2677.39+43.67+73.694.64-1.69-2.86
60-(9.66-0.22)89.8+(12.9+7.6)3.89+2.26+1.38
一、口算。
3.8+0.5=8.7-3.2=0.6-0.41=6.8+0.1=
7.4-0.1=7.5+2.1=0.77-0.3=7.3-0.6=
8.1+0.5=6.2+2.9=0.89+0.4=6.5-0.7=
7.2+0.5=6.8+4.7=0.64-0.19=3.8-0.4=
7.1+0.2=7.2+1.4=0.75+0.27=6+0.2=
4+0.7=7.6+4.5=0.77+0.38=1.6-0.7=
8.8-0.8=7+1.2=0.74+0.21=4.7-0.9=
4.7-0.7=7.3-0.6=0.7-0.48=5.5-0.7=
二、混合运算。
0.65-0.25+9.69.8-0.27-1.7396.8-26+23.7
89.82-43.39+24.5882.13+34.05+65.017.39+1.01-1.25
40-(4.32-0.46)63.8-(28.9-9.1)9.25-4.41+3.35
一、口算。
7.9-0.9=6.1+1.9=0.71-0.13=6.8-0.5=
4.9+0.6=7.1+0.2=0.69+0.4=8.1+0.6=
4.4+0.6=7.2-1.5=0.76-0.41=3.3+0.6=
4.4+0.4=6.7-4.4=0.81-0.28=5.6-0.3=
7.7-0.2=6.6+1.2=0.75+0.26=3.9-0.8=
6.3-0.3=8.6+0.2=0.62-0.09=8.9-0.1=
3.1+0.5=6.1-3.8=0.79-0.31=3.3-0.6=
8.1+0.8=8.5-2.3=0.76-0.2=2.7+0.3=
二、混合运算。
0.77+0.18+4.47.7-0.3-4.737+13.4-19.4
65.22-12.2+47.9272.13+46.68+10.389.93-1.51-7.58
60-(4.33-0.63)74.9+(11.3+1.9)6.42+1.88+1.4
一、口算。
2.5+0.6=6.2-3.8=0.72-0.19=2.7-0.4=
3.4+0.7=8.9+0.6=0.6-0.09=6.6-0.1=
6.4-0.1=7.7-0.9=0.72-0.43=8.3+0.4=
3.8-0.6=6.4-1.2=0.61-0.43=2.8-0.2=
7.4-0.2=6.3-4.6=0.72-0.02=5.3+0.8=
1.9+0.5=6-0.5=0.7+0.08=6.6-0.3=
7.1+0.1=8.5+0.9=0.9-0.13=1+0.2=
2.1-0.2=8.9-3.5=0.75+0.28=2.4+0.4=
二、混合运算。
0.6+0.23+1.29.4-0.1-2.972+29.6-24.1
63.94+23.1+92.7169.07-39.48+17.427.76-3.44-3.39
60-(8.84-0.77)78.4-(15.3+6.8)4.46+2.44-1.85
一、口算。
4.9+0.5=7.5+3.1=0.66+0.46=1.2-0.5=
4.7+0.8=6+2.5=0.62+0.1=4.8-0.6=
4.5-0.9=6.6+1=0.8+0.02=7.5-0.5=
8.1-0.2=7.7+4.5=0.6+0.46=2.6-0.6=
3.6+0.4=6.8-4=0.63+0.03=4.6+0.2=
1.3+0.6=7.4-4.5=0.6+0.41=8.9+0.6=
6.1-0.4=8.9-1.6=0.86-0.29=8+0.2=
5.9-0.7=8.3+3=0.69-0.14=4.4+0.5=
二、混合运算。
0.82+0.47+6.68.1-0.32-2.6857.8+20.3-20.5
84.61+47.02+83.5570.22-18.03+68.659.92+3.55+3.25
70-(3.92+0.17)88.8-(24.8-1.2)9.32-3.73+1.61
一、口算。
4.2-0.1=9-1.4=0.86+0.32=6-0.2=
4-0.6=7.1+0.8=0.7+0.49=5.7+0.1=
5.5-0.7=6.6+1.9=0.83+0.19=3.8+0.9=
4.1-0.3=8.4-0.9=0.86-0.29=4.7+0.1=
2.7+0.3=8.7+4.1=0.87-0.06=3.7+0.9=
6-0.3=6.8+1.2=0.61-0.28=3.3-0.3=
8.4-0.5=6.7-4.2=0.72-0.21=1.4+0.9=
2.9+0.4=8-2.7=0.63-0.23=3.7-0.2=
二、混合运算。
0.87-0.34+9.89.3-0.2-0.836.5+14.3+20.7
66.62-39.29+93.0382.39-41.53+56.049.21+2.74-4.78
50-(2.95-0.63)86.1+(18.4+2.4)3.58-1.66-1.46
一、口算。
7.1+0.6=8.5-3.1=0.6+0.4=1.2+0.9=
5.9+0.5=8.4-2=0.87-0.17=3.5-0.2=
8-0.9=8.6+2.9=0.74-0.27=5.6+0.5=
8.8+0.9=6.7+4.5=0.61+0.04=3.9+0.3=
6.7+0.9=7.6-3.1=0.61+0.24=3.2+0.8=
4.2+0.8=7.3-1.6=0.89+0.14=3-0.3=
6.1+0.2=8-0.9=0.77+0.15=4.7-0.5=
2+0.9=8.4-4.8=0.77-0.33=8.6-0.9=
二、混合运算。
0.74-0.46+7.48.3-0.56-4.4499.8+34.8+58.5
65.56+30.75+16.1177.54+16.82+84.47.3-5.09-1.36
20-(2.47-0.97)94.8-(15.2-6.1)7.89-6.13+1.34
一、口算。
1.6-0.3=8.2+0.7=0.88+0.4=6.2+0.4=
2.9+0.9=6.9+1.9=0.89+0.26=5.5+0.9=
4.1-0.6=7.7+1.6=0.84+0.45=1.7-0.5=
3.7+0.9=6.3-4.3=0.62+0.23=8.5+0.1=
7.7-0.6=7-4.1=0.75-0.16=4.7+0.6=
3.5-0.7=8.4+1.7=0.84-0.27=8.1+0.5=
7.2-0.3=8.5+0.8=0.82+0.09=7.4-0.8=
8.5-0.9=7-3.6=0.82-0.2=2.4+0.9=
二、混合运算。
0.86+0.05+9.79.3-0.63-0.3778.3-27.2+26.2
80.3+46.79+41.1479.4+17.55+87.644.48+2.61-1.71
90-(2.16-0.59)90.7+(21.5+3)3.7-1.95+1.38
一、口算。
5.1-0.2=8.4+2.5=0.73+0.34=8.6+0.5=
5.4-0.1=6.3-4.1=0.6+0.08=2.2-0.7=
3.5-0.9=6.2+0.3=0.72-0.42=4.5-0.2=
8.2-0.8=6.2+1.2=0.62-0.43=2.2+0.9=
8.9-0.7=7.9+3.7=0.61+0.24=8.4-0.7=
4.4+0.6=8.1-1.3=0.79-0.2=7.9-0.9=
7.5-0.9=6.7-3.2=0.85-0.45=4.6-0.6=
7.1+0.5=