Basic Math Symbols

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Across
  1. 4. ≥,≤
  2. 8. mod
  3. 9. a^b ,exponent
  4. 12. a², exponent
  5. 15. ppm
  6. 16. — division or fraction
  7. 17. *multiplication
  8. 18. ppb
  9. 19. [ ]
Down
  1. 1. - subtraction
  2. 2. √a
  3. 3. ³√a
  4. 5. ≠ inequality
  5. 6. ‰
  6. 7. %
  7. 10. = equality
  8. 11. ()
  9. 13. +addition
  10. 14. ×,multiplication
  11. 15. decimal point separator