Numbers crossword

1234567891011121314151617181920
Across
  1. 2. 10 divided by 10
  2. 6. 5 x 3 - 1
  3. 8. 25 divided by 5
  4. 9. 1 times 1 plus 1
  5. 11. 12 divided by 4
  6. 13. the age when you can vote
  7. 16. a lucky number
  8. 18. (2 x 3) + 1
  9. 19. 100 divided by 2 minus 30
  10. 20. (2 x 5 x 2) - 4
Down
  1. 1. 10 minus 6
  2. 3. 9 + 9 + 1
  3. 4. this number rhymes with "gate"
  4. 5. a lucky number + 4
  5. 7. four bigger than 7
  6. 10. 100 - 88
  7. 12. this number rhymes with "sticks"
  8. 14. (3 x 4) - 3
  9. 15. this number divided by 3 = 5
  10. 17. 1 x 10