Last year vocabulary

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Across
  1. 2. 1,000
  2. 3. natural numbers and negative natural numbers
  3. 4. after the 3rd
  4. 6. French say “virgule”
  5. 7. ≈ means “… equals to”
  6. 9. is a ... b
  7. 12. 1, 3, 5, 7, 9, 11… are the … numbers
  8. 13. -
  9. 14.
  10. 17. 249 is a three-... number
  11. 19. by :
  12. 20. The … century fox makes films since 1935 :
  13. 21. 1,000,000,000
  14. 23. 2, 4, 6, 8, 10… are the … numbers
Down
  1. 1. 100 and 101 are …natural numbers
  2. 5. separation within a number writing
  3. 6. a  b
  4. 8. a + b
  5. 10. replacing a number with an approximate value that has a shorter representation
  6. 11. has exactly two divisors 1 and itself
  7. 15. is a … number
  8. 16. =
  9. 18. is an … fraction
  10. 22. ℝ ℕ and ℤ are … of numbers