21-3-3-3-3-3-3-3=0
21:3=7
3×7=21
7×3=21
36-4-4-4-4-4-4-4-4-4=0
36:4=9
9×4=36
4×9=36
42-6-6-6-6-6-6-6=0
42:6=7
6×7=42
7×6=42
49-7-7-7-7-7-7-7=0
49:7=7
7×7=49
7×7=49
63-7-7-7-7-7-7-7-7-7=0
63:7=9
7×9=63
9×7=63
56-8-8-8-8-8-8-8=0
56:8=7
8×7=56
7×8=56
54-6-6-6-6-6-6-6-6-6=0
54:6=9
6×9=54
9×6=54
81-9-9-9-9-9-9-9-9-9=0
81:9=9
9×9=81
9×9=81
Dacă tu crezi că merit, astept coroana!