Crossword puzzle - Basic math sy

12345678910111213141516171819
Across
  1. 1. ppm
  2. 2. horizontal line
  3. 5. +
  4. 7. obelus
  5. 9. *
  6. 10. decimal point, decimal separator
  7. 11. exponent
  8. 12. ppb
  9. 13. a²
  10. 16. []
  11. 17. a^b
  12. 18. greater than or equal.
  13. 19. multiplication
Down
  1. 1. ppt
  2. 3. -
  3. 4. ()
  4. 6. ‰
  5. 8. remainder calculation
  6. 14. =
  7. 15. %