Basic Math Symbols

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Across
  1. 1. calculate expression inside first
  2. 5. 3√a
  3. 7. ±
  4. 10. n√a
  5. 11. exponent
  6. 12. ‰
  7. 13. decimal point, decimal separator
  8. 15. −
  9. 18. division / fraction
  10. 20. ppt
Down
  1. 2. ≈
  2. 3. addition
  3. 4. ±
  4. 6. [ ]
  5. 8. %
  6. 9. 1ppb = 1/1000000000
  7. 14. *
  8. 16. √a
  9. 17. mod
  10. 19. less than or equal to