There are 12 possible answers: 1. 2 × 50 = 100 2. 4 × 25 = 100 3. 4 × 50 = 200 4. 4 × 75 = 300 5. 5 × 20 = 100 6. 5 × 40 = 200 7. 5 × 60 = 300 8. 5 × 80 = 400 9. 6 × 50 = 300 10. 8 × 25 = 200 11. 8 × 50 = 400 12. 8 × 75 = 600 Edwin