Basic math symbols

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Across
  1. 2. √a
  2. 5. less than or equal to
  3. 6. decimal point decimal separator
  4. 8. %
  5. 10. /
  6. 11. exponent
  7. 12. ≠
  8. 15. *
  9. 16. +
  10. 18. multiplication
  11. 19. 4√a
Down
  1. 1. =
  2. 3. >
  3. 4. mod
  4. 7. [ ]
  5. 8. ‰
  6. 9. <
  7. 13. ÷
  8. 14. subtraction
  9. 17. calculate expression inside first