BASIC MATH SYMBOLS

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Across
  1. 6. x
  2. 8. Equal sign
  3. 9. ‰
  4. 13. per-billion
  5. 14. ( )
  6. 16. per-trillion
  7. 17. both plus and minus operations
  8. 19. ÷
  9. 20. .
Down
  1. 1. %
  2. 2. -
  3. 3. less than or equal to
  4. 4. a^b
  5. 5. not equal sign
  6. 7. Per-million
  7. 10. [ ]
  8. 11. -
  9. 12. *
  10. 15. +
  11. 18. remainder calculation