Ответ:

  1. 5 × 10 = 50
  2. 14 × 20 = 280
  3. 12 × 20 = 240
  4. 8 × 40 = 320
  5. 16 × 20 = 320
  6. 7 × 30 = 210
  7. 9 × 10 = 90
  8. 11 × 20 = 220
  9. 10 × 20 = 200
  10. 15 × 40 = 600
  11. 20 × 20 = 400
  12. 6 × 60 = 360
  13. 13 × 20 = 260
  14. 18 × 50 = 900
  15. 12 × 20 = 240