《2025年1课1练五年级数学上册冀教版》

1. 直接写出得数。（6 分）
$0.8×10 =$
$0.2×5 =$
$0.7×11 =$
$2.2×3 =$
$0.3×0.9 =$
$0.25×4 =$
$3×0.36 =$
$1.2×0.4 =$
$5.5×0.3 =$
$10.6×0.2 =$
$0.55×0.1 =$
$40×0.05 =$

答案： 8
1
7.7
6.6
0.27
1
1.08
0.48
1.65
2.12
0.055
2

2. 竖式计算。（12 分）
$8.7×1.5$
$6.75×0.16$
$0.56×1.3$
$3.04×1.8$
$7.13×0.68$
$3.25×5.6$

答案： 2. 竖式计算。
1. $8.7×1.5 = 13.05$
```
8.7
×1.5
------
435
87
------
13.05
```
2. $6.75×0.16 = 1.08$
```
6.75
×0.16
------
4050
675
------
1.0800
```
3. $0.56×1.3 = 0.728$
```
0.56
×1.3
------
168
56
------
0.728
```
4. $3.04×1.8 = 5.472$
```
3.04
×1.8
------
2432
304
------
5.472
```
5. $7.13×0.68 = 4.8484$
```
7.13
×0.68
------
5704
4278
------
4.8484
```
6. $3.25×5.6 = 18.2$
```
3.25
×5.6
------
1950
1625
------
18.200
```

3. 用简便方法计算下面各题。（12 分）
$2.5×40.1$
$13.68×5.7 + 13.68×5.3 - 13.68$
$1.25×88 - 1.25×8$
$9.73×9.9 + 0.973$

答案： 1. $2.5×40.1$
$=2.5×(40 + 0.1)$
$=2.5×40 + 2.5×0.1$
$=100 + 0.25$
$=100.25$
2. $13.68×5.7 + 13.68×5.3 - 13.68$
$=13.68×(5.7 + 5.3 - 1)$
$=13.68×10$
$=136.8$
3. $1.25×88 - 1.25×8$
$=1.25×(88 - 8)$
$=1.25×80$
$=100$
4. $9.73×9.9 + 0.973$
$=9.73×9.9 + 9.73×0.1$
$=9.73×(9.9 + 0.1)$
$=9.73×10$
$=97.3$