1. 口算。
（1）$30×2 =$　　$40×3 =$　　$40×6 =$　　$50×3 =$
$80×4 =$　　$70×6 =$　　$90×2 =$　　$20×3 =$
$13×2 =$　　$21×3 =$　　$12×3 =$　　$41×2 =$
$32×3 =$　　$12×2 =$　　$33×2 =$　　$11×9 =$
（2）$202×3 =$　　$301×2 =$　　$108×5 =$　　$302×4 =$
$204×5 =$　　$407×2 =$　　$208×6 =$　　$607×4 =$

（1）
$30×2 = 60$　　$40×3 = 120$　　$40×6 = 240$　　$50×3 = 150$
$80×4 = 320$　　$70×6 = 420$　　$90×2 = 180$　　$20×3 = 60$
$13×2 = 26$　　$21×3 = 63$　　$12×3 = 36$　　$41×2 = 82$
$32×3 = 96$　　$12×2 = 24$　　$33×2 = 66$　　$11×9 = 99$
（2）
$202×3 = 606$　　$301×2 = 602$　　$108×5 = 540$　　$302×4 = 1208$
$204×5 = 1020$　　$407×2 = 814$　　$208×6 = 1248$　　$607×4 = 2428$

2. 用竖式计算。
43×2
82×4
26×7
87×8
123×3
214×4
159×9
265×7
205×5
180×6
250×5
605×4

```
43
× 2
----
86
```
43×2=86
---
```
82
× 4
----
328
```
82×4=328
---
```
26
× 7
----
182
```
26×7=182
---
```
87
× 8
----
696
```
87×8=696
---
```
123
× 3
-----
369
```
123×3=369
---
```
214
× 4
-----
856
```
214×4=856
---
```
159
× 9
-----
1431
```
159×9=1431
---
```
265
× 7
-----
1855
```
265×7=1855
---
```
205
× 5
-----
1025
```
205×5=1025
---
```
180
× 6
-----
1080
```
180×6=1080
---
```
250
× 5
-----
1250
```
250×5=1250
---
```
605
× 4
-----
2420
```
605×4=2420