BASIC MATH SYMBOL

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Across
  1. 1. per-million
  2. 3. root 3√a - 3√a - 3√a = a
  3. 5. both plus and minus operations
  4. 7. +
  5. 9. a^b
  6. 11. √a - √a = a
  7. 15. per-trillion
  8. 16. ‰
  9. 19. ×
  10. 20. greater than or equal to
Down
  1. 2. ‰
  2. 4. =
  3. 6. root √a - √a = a
  4. 8. not equal sign
  5. 10. *
  6. 11. -
  7. 12. ≠
  8. 13. [ ]
  9. 14. per-billion
  10. 17. decimal point
  11. 18. remainder calculation