Basic Math Symbols

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Across
  1. 5. ≈
  2. 8. [ ]
  3. 9. a^b
  4. 12. exponent
  5. 14. per-trillion
  6. 16. greater than
  7. 17. <
  8. 18. ÷
Down
  1. 1. remainder calculation
  2. 2. times sign
  3. 3. equals sign
  4. 4. minus sign
  5. 6. per-billion
  6. 7. 1%=1/100
  7. 10. plus sign
  8. 11. ≠
  9. 13. ( )
  10. 14. .
  11. 15. *