Basic Math Symbols

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Across
  1. 2. []
  2. 3. ≥
  3. 5. a²
  4. 8. -
  5. 10. ‰
  6. 13. ≤
  7. 15. <
  8. 16. ppm
  9. 18. ÷
  10. 19. .
  11. 20. ≠
Down
  1. 1. >
  2. 4. ppt
  3. 6. 3√a
  4. 7. mod
  5. 9. / it is also used for division
  6. 11. ()
  7. 12. +
  8. 14. * it is also used for multiplication
  9. 17. %