① 先估一估商是几位数,再用竖式计算。
368 ÷ 4 =
估:商是位数
830 ÷ 4 =
估:商是位数
724 ÷ 9 =
估:商是位数
206 ÷ 3 =
估:商是位数
368 ÷ 4 =
估:商是位数
830 ÷ 4 =
估:商是位数
724 ÷ 9 =
估:商是位数
206 ÷ 3 =
估:商是位数
答案
368 ÷ 4 = 92
估:商是两位数
```
92
______
4 |368
36
______
8
8
______
0
```
830 ÷ 4 = 207……2
估:商是三位数
```
207
______
4 |830
8
______
3
0
______
30
28
______
2
```
724 ÷ 9 = 80……4
估:商是两位数
```
80
______
9 |724
72
______
4
0
______
4
```
206 ÷ 3 = 68……2
估:商是两位数
```
68
______
3 |206
18
______
26
24
______
2
```
估:商是两位数
```
92
______
4 |368
36
______
8
8
______
0
```
830 ÷ 4 = 207……2
估:商是三位数
```
207
______
4 |830
8
______
3
0
______
30
28
______
2
```
724 ÷ 9 = 80……4
估:商是两位数
```
80
______
9 |724
72
______
4
0
______
4
```
206 ÷ 3 = 68……2
估:商是两位数
```
68
______
3 |206
18
______
26
24
______
2
```
② 用竖式计算。(打 * 的要验算)
$385 ÷ 6 =$
$227 ÷ 3 =$
$*750 ÷ 7 =$
$385 ÷ 6 =$
$227 ÷ 3 =$
$*750 ÷ 7 =$
答案
$385 ÷ 6 = 64······1$
```
64
______
6 |385
36
______
25
24
______
1
```
---
$227 ÷ 3 = 75······2$
```
75
______
3 |227
21
______
17
15
______
2
```
---
$^*750 ÷ 7 = 107······1$
```
107
_______
7 |750
7
_______
50
49
_______
1
```
验算:
```
107
× 7
______
749
+ 1
______
750
```
```
64
______
6 |385
36
______
25
24
______
1
```
---
$227 ÷ 3 = 75······2$
```
75
______
3 |227
21
______
17
15
______
2
```
---
$^*750 ÷ 7 = 107······1$
```
107
_______
7 |750
7
_______
50
49
_______
1
```
验算:
```
107
× 7
______
749
+ 1
______
750
```
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