Basic math symbols

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Across
  1. 4. multiplication
  2. 6. %
  3. 10. subtraction
  4. 13. greater than or equal to
  5. 14. /
  6. 16. ppt
  7. 17. formed by two rays
  8. 18. exponent
  9. 19. infinite line
Down
  1. 1. >
  2. 2. ^
  3. 3. ppm
  4. 5. [ ]
  5. 7. addition
  6. 8. decimal point
  7. 9. division
  8. 11. ( )
  9. 12. remainder calculation
  10. 15. <