Basic math symbols

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Across
  1. 3. ( )
  2. 4. a^b
  3. 5. n√a
  4. 6. Meaning or definition of ≈
  5. 10. ±
  6. 11. *
  7. 12. ≠
  8. 14. Definition of plus sign
  9. 17. Definition of >
  10. 18. /
  11. 19. symbol name of modulo
  12. 20. Symbol name of -
Down
  1. 1. ³√a
  2. 2. ppt
  3. 7. %
  4. 8. Definition of times sign
  5. 9. definitions of minus sign
  6. 13. ⁴√a.
  7. 15. It is a decimal point
  8. 16. definition of <