Basic Math Symbols

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Across
  1. 2. =
  2. 4. ppm
  3. 6. ≤
  4. 9. ppt
  5. 13. ³√a
  6. 14. ÷
  7. 15. calculate expression inside first
  8. 17. >
  9. 19. ≈
  10. 20. a^b
Down
  1. 1. /
  2. 3. ×
  3. 5. remainder calculation
  4. 7. —
  5. 8. √a
  6. 10. +
  7. 11. ppb
  8. 12. *
  9. 16. -
  10. 18. calculate expression inside first