Правило:
| \( 7 \cdot 10 \cdot 10 = 700 \) | \( 100 \cdot 8 - 10 \cdot 8 = 800 - 80 = 720 \) | \( 80 : 10 \cdot 5 = 8 \cdot 5 = 40 \) | |
| \( 900 : 10 : 10 = 90 : 10 = 9 \) | \( 90 \cdot 10 : 100 = 900 : 100 = 9 \) | \( 400 : 100 \cdot 7 = 4 \cdot 7 = 28 \) | |
| \( 300 : 100 : 1 = 3 : 1 = 3 \) | \( 200 : 10 : 1 = 20 : 1 = 20 \) | \( 100 \cdot 5 - 5 = 500 - 5 = 495 \) | |
| \( 40 \cdot 10 : 100 = 400 : 100 = 4 \) | \( 50 : 5 \cdot 100 = 10 \cdot 100 = 1000 \) | \( 200 : 10 : 10 = 20 : 10 = 2 \) | |
| \( 10 \cdot 10 \cdot 10 = 1000 \) | \( 100 : 10 \cdot 16 = 10 \cdot 16 = 160 \) | \( 100 \cdot 5 + 10 \cdot 5 = 500 + 50 = 550 \) | |
| \( 0 \cdot 100 \cdot 10 = 0 \) | \( 0 \cdot 10 \cdot 100 = 0 \) | \( 100 \cdot 9 - 10 \cdot 9 = 900 - 90 = 810 \) | |
| \( 1000 : 10 : 10 = 100 : 10 = 10 \) | \( 100 : 100 \cdot 25 = 1 \cdot 25 = 25 \) | \( 100 \cdot 3 - 1 \cdot 3 = 300 - 3 = 297 \) | |
| \( 100 : 100 \cdot 40 = 1 \cdot 40 = 40 \) | \( 300 : 100 \cdot 5 = 3 \cdot 5 = 15 \) | \( 300 : 10 : 6 = 30 : 6 = 5 \) | |
| \( 10 \cdot 7 : 70 = 70 : 70 = 1 \) | \( 400 : 10 \cdot 8 = 40 \cdot 8 = 320 \) | \( 10 \cdot 4 - 10 \cdot 2 = 40 - 20 = 20 \) | |
| \( 540 : 10 : 9 = 54 : 9 = 6 \) | \( 600 : 10 : 6 = 60 : 6 = 10 \) | \( (10 - 10) \cdot 100 = 0 \cdot 100 = 0 \) | |
| \( 10 : 10 \cdot 15 = 1 \cdot 15 = 15 \) | \( 100 : 10 \cdot 7 = 10 \cdot 7 = 70 \) | \( 1 \cdot 1 \cdot 10 = 10 \) | |
| \( 10 \cdot (500 : 100) = 10 \cdot 5 = 50 \) | \( 600 : 10 : 6 = 60 : 6 = 10 \) | \( 100 \cdot 10 - 4 = 1000 - 4 = 996 \) | |
| \( 10 \cdot (60 : 10) = 10 \cdot 6 = 60 \) | \( 480 : 10 : 8 = 48 : 8 = 6 \) | \( 1000 : 100 : 2 = 10 : 2 = 5 \) |