1. 直接写得数。
$25×20= $
$10×39= $
$20×14= $
$25×20= $
500
$20×80= $1600
$40×12= $480
$12×60= $720
$10×39= $
390
$40×90= $3600
$11×90= $990
$60×7= $420
$20×14= $
280
$60×70= $4200
$70×11= $770
$28×4= $112
答案
500
1600
480
720
390
3600
990
420
280
4200
770
112
1600
480
720
390
3600
990
420
280
4200
770
112
2. 用竖式计算。(带“☆”的要检验。)
$37×48=$```
37
×48
----
296
1480
----
1776
``` ☆$73×30=$```
73
×30
----
2190
```
检验:
```
30
×73
----
90
2100
----
2190
``` $20×55=$```
55
×20
----
1100
```
$306×24=$```
306
×24
----
1224
6120
----
7344
``` ☆$303×20=$```
303
×20
----
6060
```
检验:
```
20
×303
----
6060
``` $260×14=$```
260
×14
----
1040
2600
----
3640
```
$180×40=$```
180
×40
----
7200
``` $15×390=$```
390
×15
----
1950
3900
----
5850
``` ☆$42×102=$```
102
×42
----
204
4080
----
4284
```
检验:
```
42
×102
----
84
4200
----
4284
```
$37×48=$```
37
×48
----
296
1480
----
1776
``` ☆$73×30=$```
73
×30
----
2190
```
检验:
```
30
×73
----
90
2100
----
2190
``` $20×55=$```
55
×20
----
1100
```
$306×24=$```
306
×24
----
1224
6120
----
7344
``` ☆$303×20=$```
303
×20
----
6060
```
检验:
```
20
×303
----
6060
``` $260×14=$```
260
×14
----
1040
2600
----
3640
```
$180×40=$```
180
×40
----
7200
``` $15×390=$```
390
×15
----
1950
3900
----
5850
``` ☆$42×102=$```
102
×42
----
204
4080
----
4284
```
检验:
```
42
×102
----
84
4200
----
4284
```
答案
37×48=1776
```
37
×48
----
296
1480
----
1776
```
☆73×30=2190
```
73
×30
----
2190
```
检验:
```
30
×73
----
90
2100
----
2190
```
20×55=1100
```
55
×20
----
1100
```
306×24=7344
```
306
×24
----
1224
6120
----
7344
```
☆303×20=6060
```
303
×20
----
6060
```
检验:
```
20
×303
----
6060
```
260×14=3640
```
260
×14
----
1040
2600
----
3640
```
180×40=7200
```
180
×40
----
7200
```
15×390=5850
```
390
×15
----
1950
3900
----
5850
```
☆42×102=4284
```
102
×42
----
204
4080
----
4284
```
检验:
```
42
×102
----
84
4200
----
4284
```
```
37
×48
----
296
1480
----
1776
```
☆73×30=2190
```
73
×30
----
2190
```
检验:
```
30
×73
----
90
2100
----
2190
```
20×55=1100
```
55
×20
----
1100
```
306×24=7344
```
306
×24
----
1224
6120
----
7344
```
☆303×20=6060
```
303
×20
----
6060
```
检验:
```
20
×303
----
6060
```
260×14=3640
```
260
×14
----
1040
2600
----
3640
```
180×40=7200
```
180
×40
----
7200
```
15×390=5850
```
390
×15
----
1950
3900
----
5850
```
☆42×102=4284
```
102
×42
----
204
4080
----
4284
```
检验:
```
42
×102
----
84
4200
----
4284
```
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