Mathematics

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Across
  1. 2. 222+222=
  2. 4. 111,222,...,444,555..
  3. 6. 1000-200=
  4. 7. 400+50+6=
  5. 11. 136,140,144,...,152..
  6. 12. The numbers that comes after that 999
  7. 13. 806-539=
  8. 14. 800,802,804,....,808..
  9. 17. 330,333,...,339,342..
  10. 18. 452+892=
  11. 20. 940-539=
  12. 21. 400,410,...,430,440..
  13. 22. The number immediately before 317
  14. 24. 299+240=
Down
  1. 1. 806-403=
  2. 3. 927-509=
  3. 4. 1344-1040=
  4. 5. 820-444=
  5. 8. 418 + 100=
  6. 9. 556+506=
  7. 10. The number before 318
  8. 11. 248+792=
  9. 14. 800,804,808,812,...,820
  10. 15. 600,...,602,603..
  11. 16. 1040-100=
  12. 19. 900-600=
  13. 20. 634-231
  14. 23. 121,122,...,124,125