2 × 6 × 5 = 6 × ( 2 × 5 ) = 6 × 10 = 60
2 × 6 × 2 = ( 2 × 2 ) × 6 = 4 × 6 = 24
7 × 2 × 3 = 7 × ( 2 × 3 ) = 7 × 6 = 42
4 × 5 × 2 = 4 × ( 5 × 2 ) = 4 × 10 = 40
sau: 4 × 5 × 2 = ( 4 × 2 ) × 5 = 8 × 5 = 40
→ am aplicat asociativitatea ( proprietate a inmultirii )