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一、直接写出得数。(每题1分,共32分)
15×40=
5.6+5=
0.3+0.87=
0.8-0.18+0.2=
2.8+7.2=
3-0.2=
0.36+0.44=
0.9+2.01+0.3=
2.7+4.5=
0.7+1.3=
2.04+0.8=
5.4-3.8+4.5=
9.6-2.6=
4.3+0.9=
0.67+1.24=
7.6+2.9-7.6=
2.4+4.6=
808×5=
1.5-0.75=
4.3-2.8+1.7=
7.2+2.7=
7.8+0.4=
4.1-0.39=
9.9+9.8+9.7=
198÷18=
9.6-0.7=
8.5+1.91=
13.6-6.3-2.7=
9.3-3.9=
6.5+2.5=
7.6-0.32=
360÷(9.27+2.73)=
15×40=
600
5.6+5=
10.6
0.3+0.87=
1.17
0.8-0.18+0.2=
0.82
2.8+7.2=
10
3-0.2=
2.8
0.36+0.44=
0.8
0.9+2.01+0.3=
3.21
2.7+4.5=
7.2
0.7+1.3=
2
2.04+0.8=
2.84
5.4-3.8+4.5=
6.1
9.6-2.6=
7
4.3+0.9=
5.2
0.67+1.24=
1.91
7.6+2.9-7.6=
2.9
2.4+4.6=
7
808×5=
4040
1.5-0.75=
0.75
4.3-2.8+1.7=
3.2
7.2+2.7=
9.9
7.8+0.4=
8.2
4.1-0.39=
3.71
9.9+9.8+9.7=
29.4
198÷18=
11
9.6-0.7=
8.9
8.5+1.91=
10.41
13.6-6.3-2.7=
4.6
9.3-3.9=
5.4
6.5+2.5=
9
7.6-0.32=
7.28
360÷(9.27+2.73)=
30
答案
600 10.6 1.17 0.82 10 2.8 0.8 3.21 7.2 2 2.84 6.1 7 5.2 1.91 2.9 7 4040 0.75 3.2 9.9 8.2 3.71 29.4 11 8.9 10.41 4.6 5.4 9 7.28 30
二、用竖式计算,带☆的要验算。(每题3分,验算各1分,共21分)
26.9+41.1=
30-0.97=
☆11.626+8.56=
☆47.8-12.22=
37.99+14.1=
☆80.65-6.301=
竖式及验算略
26.9+41.1=
68
30-0.97=
29.03
☆11.626+8.56=
20.186
☆47.8-12.22=
35.58
37.99+14.1=
52.09
☆80.65-6.301=
74.349
竖式及验算略
答案
68 29.03 20.186 35.58 52.09 74.349 竖式及验算略
解析
```
26.9
+41.1
------
68.0
30.00
0.97
------
29.03
11.626
+ 8.560
------
20.186
验算：
20.186
8.560
------
11.626
47.80
-12.22
------
35.58
验算：
35.58
+12.22
------
47.80
37.99
+14.10
------
52.09
80.650
6.301
------
74.349
验算：
74.349
+ 6.301
------
80.650
```
26.9
+41.1
------
68.0
30.00
0.97
------
29.03
11.626
+ 8.560
------
20.186
验算：
20.186
8.560
------
11.626
47.80
-12.22
------
35.58
验算：
35.58
+12.22
------
47.80
37.99
+14.10
------
52.09
80.650
6.301
------
74.349
验算：
74.349
+ 6.301
------
80.650
```
三、计算下面各题,能简算的要简算。(每题3分,共24分)
10+0.009+0.191
3.75-0.75-1.25
4.07-0.77+8.93
34.5-(17.2+4.5)
42-6.84-8.16
18.75+76.3-0.75+3.7
36.12+36.56+35.45+35.99+36.02
0.9+0.99+0.999+0.9999
10+0.009+0.191
3.75-0.75-1.25
4.07-0.77+8.93
34.5-(17.2+4.5)
42-6.84-8.16
18.75+76.3-0.75+3.7
36.12+36.56+35.45+35.99+36.02
0.9+0.99+0.999+0.9999
答案
10.2 1.75 12.23 12.8 27 98 180.14 3.8889
解析
10+0.009+0.191
=10+(0.009+0.191)
=10+0.2
=10.2
3.75-0.75-1.25
=3.75-(0.75+1.25)
=3.75-2
=1.75
4.07-0.77+8.93
=4.07+8.93-0.77
=13-0.77
=12.23
34.5-(17.2+4.5)
=34.5-4.5-17.2
=30-17.2
=12.8
42-6.84-8.16
=42-(6.84+8.16)
=42-15
=27
18.75+76.3-0.75+3.7
=(18.75-0.75)+(76.3+3.7)
=18+80
=98
36.12+36.56+35.45+35.99+36.02
=(36.12+35.99)+(36.56+35.45)+36.02
=72.11+72.01+36.02
=144.12+36.02
=180.14
0.9+0.99+0.999+0.9999
=(1-0.1)+(1-0.01)+(1-0.001)+(1-0.0001)
=4-(0.1+0.01+0.001+0.0001)
=4-0.1111
=3.8889
=10+(0.009+0.191)
=10+0.2
=10.2
3.75-0.75-1.25
=3.75-(0.75+1.25)
=3.75-2
=1.75
4.07-0.77+8.93
=4.07+8.93-0.77
=13-0.77
=12.23
34.5-(17.2+4.5)
=34.5-4.5-17.2
=30-17.2
=12.8
42-6.84-8.16
=42-(6.84+8.16)
=42-15
=27
18.75+76.3-0.75+3.7
=(18.75-0.75)+(76.3+3.7)
=18+80
=98
36.12+36.56+35.45+35.99+36.02
=(36.12+35.99)+(36.56+35.45)+36.02
=72.11+72.01+36.02
=144.12+36.02
=180.14
0.9+0.99+0.999+0.9999
=(1-0.1)+(1-0.01)+(1-0.001)+(1-0.0001)
=4-(0.1+0.01+0.001+0.0001)
=4-0.1111
=3.8889
