Fill the Basic Math Symbols

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Across
  1. 2. ≈
  2. 4. calculate expression inside first, ( )
  3. 6. greater than or equal to
  4. 8. ≠
  5. 11. [ ]
  6. 15. 3√a
  7. 18. remainder calculation
  8. 19. both minus and plus operations
  9. 20. *
Down
  1. 1. a^b
  2. 3. both plus and minus operations
  3. 5. =
  4. 7. >
  5. 9. minus sign
  6. 10. √a
  7. 12. plus sign
  8. 13. %
  9. 14. ÷
  10. 16. <
  11. 17. decimal point, decimal separator