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1. 直接写出得数。(每题1分,共12分)
6.3 - 2.1 =
0.56 + 0.4 =
2.1 + 7.9 =
4.96 - 0.76 =
1.01 + 0.99 =
0.7 + 0.23 =
0.1 - 0.02 =
7.5 + 0.05 =
0.88 - 0.8 =
3.5 + 6.5 =
0.3 - 0.09 =
2.73 - 0.3 =
6.3 - 2.1 =
4.2
0.56 + 0.4 =
0.96
2.1 + 7.9 =
10
4.96 - 0.76 =
4.2
1.01 + 0.99 =
2
0.7 + 0.23 =
0.93
0.1 - 0.02 =
0.08
7.5 + 0.05 =
7.55
0.88 - 0.8 =
0.08
3.5 + 6.5 =
10
0.3 - 0.09 =
0.21
2.73 - 0.3 =
2.43
答案
4.2 0.96 10 4.2 2 0.93 0.08 7.55 0.08 10 0.21 2.43
2. 用竖式计算,带※的要验算。(带※的每题3分,其余每题2分,共9分)
13.29 - 5.7 =
65.4 + 34.6 =
9.54 + 21.6 =
※30 - 18.48 =
13.29 - 5.7 =
7.59
65.4 + 34.6 =
100
9.54 + 21.6 =
31.14
※30 - 18.48 =
11.52
答案
7.59 100 31.14 11.52
解析
```
13.29
5.70
------
7.59
65.4
+ 34.6
------
100.0
9.54
+ 21.60
------
31.14
30.00
18.48
------
11.52
验算：
11.52
+ 18.48
------
30.00
```
13.29
5.70
------
7.59
65.4
+ 34.6
------
100.0
9.54
+ 21.60
------
31.14
30.00
18.48
------
11.52
验算：
11.52
+ 18.48
------
30.00
```
3. 计算下面各题,能简算的要简算。(每题3分,共12分)
10.5 + 4.59 - 8.7
20 - 3.5 + 5.2
12.3 - 2.45 - 0.55
12.4 + 5.62 + (17.6 + 4.38)
10.5 + 4.59 - 8.7
20 - 3.5 + 5.2
12.3 - 2.45 - 0.55
12.4 + 5.62 + (17.6 + 4.38)
答案
6.39 21.7 9.3 40
解析
10.5 + 4.59 - 8.7
= 15.09 - 8.7
= 6.39
20 - 3.5 + 5.2
= 16.5 + 5.2
= 21.7
12.3 - 2.45 - 0.55
= 12.3 - (2.45 + 0.55)
= 12.3 - 3
= 9.3
12.4 + 5.62 + (17.6 + 4.38)
= (12.4 + 17.6) + (5.62 + 4.38)
= 30 + 10
= 40
= 15.09 - 8.7
= 6.39
20 - 3.5 + 5.2
= 16.5 + 5.2
= 21.7
12.3 - 2.45 - 0.55
= 12.3 - (2.45 + 0.55)
= 12.3 - 3
= 9.3
12.4 + 5.62 + (17.6 + 4.38)
= (12.4 + 17.6) + (5.62 + 4.38)
= 30 + 10
= 40
