1. Calculer : (2 x 3) + (2 x 4) + (2 x 5) + (2 x 6) = ?

2. (2 x 3) + (3 x 4) + (4 x 5) + (5 x 6) = ?

3. (3 x 4) + (4 x 5) + (5 x 6) + (6 x 7) = ?

4. (20 : 5) + (30 : 3) + (75 : 15) + (100 : 10) = ?

5. (75 - 50 + 5) x (35 - 12 + 2) = ?

6. 10 x 5 x 20 x 15 = ?