Basic Math Symbols

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Across
  1. 2. ‰
  2. 4. <
  3. 5. %
  4. 6. []
  5. 8. -
  6. 12. ppm
  7. 15. .
  8. 16. ()
  9. 18. * it is also used for multiplication
Down
  1. 1. ppt
  2. 3. ≥
  3. 4. ≤
  4. 7. +
  5. 9. ≠
  6. 10. >
  7. 11. ÷
  8. 13. a²
  9. 14. mod
  10. 17. / it is also used for division
  11. 19. 3√a