Amazing numbers

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Across
  1. 4. a sign that stands for something
  2. 5. to invite someone to compete
  3. 6. the board for playing chess
  4. 7. a large area of a country
  5. 10. to find the total number
  6. 11. a plan of money you can spend
  7. 14. quickly and greatly
  8. 16. to say yes and accept an idea
  9. 18. to stand for or mean something
  10. 19. out of every one hundred
  11. 20. to say you will do something
  12. 21. a journey made by air
Down
  1. 1. to want to know something
  2. 2. a set of rules or parts working together
  3. 3. a shiny white metal
  4. 5. at the present time
  5. 8. in all places
  6. 9. a plan of times for activities
  7. 12. with complete accuracy
  8. 13. to examine something carefully
  9. 15. an award given after a competition
  10. 17. a pause before acting, feeling unsure
  11. 18. to give an answer