cuentas
Suma básicas
Suma muy difíciles
Resta básicas
Resta muy difíciles
Multiplica
1:
|
| 12 |
| × 4 |
|
 |
|
2:
|
| 10 |
| × 12 |
|
 |
|
3:
|
| 8 |
| × 12 |
|
 |
|
4:
|
| 12 |
| × 7 |
|
 |
|
5:
|
| 4 |
| × 12 |
|
 |
| |
6:
|
| 12 |
| × 2 |
|
 |
|
7:
|
| 3 |
| × 12 |
|
 |
|
8:
|
| 9 |
| × 12 |
|
 |
|
9:
|
| 12 |
| × 11 |
|
 |
|
10:
|
| 11 |
| × 12 |
|
 |
| |
11:
|
| 5 |
| × 12 |
|
 |
|
12:
|
| 12 |
| × 6 |
|
 |
|
13:
|
| 12 |
| × 12 |
|
 |
|
14:
|
| 2 |
| × 12 |
|
 |
|
15:
|
| 12 |
| × 9 |
|
 |
| |
16:
|
| 12 |
| × 5 |
|
 |
|
17:
|
| 12 |
| × 8 |
|
 |
|
18:
|
| 7 |
| × 12 |
|
 |
|
19:
|
| 12 |
| × 10 |
|
 |
|
20:
|
| 12 |
| × 3 |
|
 |
|
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