Устный счёт:
| 1 | + | 8 | = | 17 | + | 2 | = | ||
| 20 | – | 12 | = | 20 | – | 3 | = | ||
| 14 | – | 4 | = | 11 | + | 6 | = | ||
| 7 | + | 13 | = | 14 | – | 5 | = | ||
| 9 | – | 6 | = | 7 | + | 2 | = | ||
| 16 | – | 13 | = | 15 | + | 4 | = | ||
| 7 | + | 2 | = | 17 | – | 14 | = | ||
| 14 | – | 13 | = | 11 | + | 9 | = | ||
| 13 | – | 7 | = | 19 | – | 11 | = | ||
| 18 | – | 6 | = | 10 | + | 4 | = | ||
| 13 | – | 12 | = | 9 | – | 3 | = | ||
| 9 | – | 1 | = | 3 | – | 2 | = | ||
| 15 | – | 9 | = | 18 | – | 2 | = | ||
| 1 | + | 3 | = | 9 | + | 11 | = | ||
| 8 | – | 7 | = | 17 | + | 3 | = | ||
| 15 | + | 1 | = | 9 | – | 1 | = | ||
| 3 | + | 7 | = | 1 | + | 3 | = | ||
| 10 | – | 8 | = | 17 | – | 9 | = | ||
| 20 | – | 7 | = | 20 | – | 11 | = | ||
| 4 | + | 4 | = | 16 | – | 6 | = | ||
| 17 | – | 4 | = | 16 | + | 2 | = | ||
| 19 | + | 1 | = | 9 | + | 11 | = | ||
| 20 | – | 4 | = | 18 | – | 15 | = | ||
| 13 | – | 4 | = | 3 | + | 1 | = | ||
| 5 | + | 2 | = | 17 | – | 9 | = | ||
