Basic Math Symbols

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Across
  1. 5. ppm; per-
  2. 6. calculate expression inside first
  3. 8. %
  4. 11. greater than or less than
  5. 13. x
  6. 15. *
  7. 16. ÷
  8. 18. /
  9. 19. minus sign
Down
  1. 1. horizontal line
  2. 2. ≈
  3. 3. plus sign
  4. 4. equals sign
  5. 7. ppt; per-
  6. 9. []
  7. 10. ppb; per-
  8. 12. exponent
  9. 13. mod
  10. 14. decimal separator
  11. 17. power