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一、直接写出得数。(每题1分,共32分)
2.7-1.5=
3.6+7=
0.8+0.72=
4-0.9-0.1=
13+5.6=
9.9-0.1=
1.5+0.43=
1000÷25÷8=
3.2+8.2=
577+314=
2.1-1.08=
4.8-0.2-0.3=
5.6+4.4=
6.8+2.2=
7.8-0.22=
3.5+2.5-1.4=
7.22+1.8=
5.6-1.65=
3.26-0.4=
2.56-0.4+1.44=
11-4.7=
0.4+1.6=
2.04+1.8=
8.4+0.6-0.4=
3.6-1.2=
80×420=
0.8-0.08=
630÷(45×2)=
2.09+1.01=
4.5+1.7=
3.2+0.25=
7.8-(10.6-10.1)=
2.7-1.5=
1.2
3.6+7=
10.6
0.8+0.72=
1.52
4-0.9-0.1=
3
13+5.6=
18.6
9.9-0.1=
9.8
1.5+0.43=
1.93
1000÷25÷8=
5
3.2+8.2=
11.4
577+314=
891
2.1-1.08=
1.02
4.8-0.2-0.3=
4.3
5.6+4.4=
10
6.8+2.2=
9
7.8-0.22=
7.58
3.5+2.5-1.4=
4.6
7.22+1.8=
9.02
5.6-1.65=
3.95
3.26-0.4=
2.86
2.56-0.4+1.44=
3.6
11-4.7=
6.3
0.4+1.6=
2
2.04+1.8=
3.84
8.4+0.6-0.4=
8.6
3.6-1.2=
2.4
80×420=
33600
0.8-0.08=
0.72
630÷(45×2)=
7
2.09+1.01=
3.1
4.5+1.7=
6.2
3.2+0.25=
3.45
7.8-(10.6-10.1)=
7.3
答案
1.2 10.6 1.52 3 18.6 9.8 1.93 5 11.4 891 1.02 4.3 10 9 7.58 4.6 9.02 3.95 2.86 3.6 6.3 2 3.84 8.6 2.4 33600 0.72 7 3.1 6.2 3.45 7.3
二、用竖式计算,带☆的要验算。(每题3分,验算各1分,共20分)
12.45+5.9=
100-21.35=
☆13.86+2.93=
45.76+8.94=
☆20.68-0.57=
18.88+100.6=
12.45+5.9=
18.35
100-21.35=
78.65
☆13.86+2.93=
16.79
45.76+8.94=
54.7
☆20.68-0.57=
20.11
18.88+100.6=
119.48
答案
18.35 78.65 16.79 54.7 20.11 119.48 竖式及验算略
解析
```
12.45
+ 5.90
------
18.35
100.00
21.35
------
78.65
13.86
+ 2.93
------
16.79
验算：
16.79
2.93
------
13.86
45.76
+ 8.94
------
54.70
20.68
0.57
------
20.11
验算：
20.11
+ 0.57
------
20.68
18.88
+100.60
------
119.48
```
12.45
+ 5.90
------
18.35
100.00
21.35
------
78.65
13.86
+ 2.93
------
16.79
验算：
16.79
2.93
------
13.86
45.76
+ 8.94
------
54.70
20.68
0.57
------
20.11
验算：
20.11
+ 0.57
------
20.68
18.88
+100.60
------
119.48
```
三、计算下面各题,能简算的要简算。(每题3分,共18分)
24.7+14.6+15.4
15.7+6.3+3.7
18.73+3.85-2.73
0.9+1.08+0.92+0.1
32.54-10.46-4.54
23.57+4.18+6.43
24.7+14.6+15.4
15.7+6.3+3.7
18.73+3.85-2.73
0.9+1.08+0.92+0.1
32.54-10.46-4.54
23.57+4.18+6.43
答案
54.7 25.7 19.85 3 17.54 34.18
解析
24.7+14.6+15.4
=24.7+(14.6+15.4)
=24.7+30
=54.7
15.7+6.3+3.7
=15.7+(6.3+3.7)
=15.7+10
=25.7
18.73+3.85-2.73
=18.73-2.73+3.85
=16+3.85
=19.85
0.9+1.08+0.92+0.1
=(0.9+0.1)+(1.08+0.92)
=1+2
=3
32.54-10.46-4.54
=32.54-4.54-10.46
=28-10.46
=17.54
23.57+4.18+6.43
=23.57+6.43+4.18
=30+4.18
=34.18
=24.7+(14.6+15.4)
=24.7+30
=54.7
15.7+6.3+3.7
=15.7+(6.3+3.7)
=15.7+10
=25.7
18.73+3.85-2.73
=18.73-2.73+3.85
=16+3.85
=19.85
0.9+1.08+0.92+0.1
=(0.9+0.1)+(1.08+0.92)
=1+2
=3
32.54-10.46-4.54
=32.54-4.54-10.46
=28-10.46
=17.54
23.57+4.18+6.43
=23.57+6.43+4.18
=30+4.18
=34.18
