Basic Math Symbols

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Across
  1. 2. ×
  2. 4. <
  3. 6. horizontal line
  4. 8. ()
  5. 9. ÷
  6. 11. •
  7. 13. calculate expression inside first
  8. 14. both plus and minus operation
  9. 15. ppt
  10. 18. ≠
  11. 20. remainder calculation
  12. 21. ppb
Down
  1. 1. exponent
  2. 3. ^
  3. 5. ≈
  4. 7. +
  5. 10. ppm
  6. 12. *
  7. 16. =
  8. 17. %
  9. 19. -