1 算一算。
$36 ÷ 4 =$
$300 ÷ 3 =$
$630 ÷ \_\_\_\_\_\_ = 7$
$360 ÷ 4 =$
$300 ÷ 5 =$
$\_\_\_\_\_\_ ÷ 5 = 50$
$360 ÷ 9 =$
$300 ÷ 6 =$
$\_\_\_\_\_\_ ÷ 5 = 25······4$

$36 ÷ 4 = 9$
$300 ÷ 3 = 100$
$630 ÷ \underline{90} = 7$
$360 ÷ 4 = 90$
$300 ÷ 5 = 60$
$\underline{250} ÷ 5 = 50$
$360 ÷ 9 = 40$
$300 ÷ 6 = 50$
$\underline{129} ÷ 5 = 25······4$

② 用竖式计算。(打 * 的要验算)
$65 ÷ 5 =$
$65 ÷ 3 =$
$*65 ÷ 6 =$
$82 ÷ 7 =$
$82 ÷ 9 =$
$*82 ÷ 4 =$

$65÷5=13$
```
13
5)65
5
---
15
15
---
0
```
$65÷3=21······2$
```
21
3)65
6
---
5
3
---
2
```
$^*65÷6=10······5$
```
10
6)65
6
---
5
0
---
5
```
验算：
```
10
× 6
----
60
+ 5
----
65
```
$82÷7=11······5$
```
11
7)82
7
---
12
7
---
5
```
$82÷9=9······1$
```
9
9)82
81
---
1
```
$^*82÷4=20······2$
```
20
4)82
8
---
2
0
---
2
```
验算：
```
20
× 4
----
80
+ 2
----
82
```

（1）400 ÷ = ÷ 90 = 5
（2）要使9÷9的商末尾是0，内最小填，最大填。
（3）一道除法算式的商和除数都是7，余数是6，这道除法算式的被除数是。

$400÷5=80$
$5×90=450$
$7×7+6=55$
答：（1）依次填80、450；（2）最小填0，最大填8；（3）填55。