Basic Math symbols

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Across
  1. 3. line fraction
  2. 5. equal approximation
  3. 8. decimal point
  4. 9. inequality greater than
  5. 10. equal to
  6. 12. sign subtraction
  7. 14. both plus and minus operation
  8. 15. multiplication
  9. 17. division
  10. 18. sign addition
Down
  1. 1. calculate expression
  2. 2. exponent
  3. 4. division
  4. 6. exponent
  5. 7. 1%=1/100
  6. 11. sign equality
  7. 12. both minus and plus operation
  8. 13. sign multiplication
  9. 16. remain calculation