Basic math simble

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Across
  1. 5. Calculate expression
  2. 7. exponent
  3. 8. ppt
  4. 9. Remainder calculation
  5. 11. ‰
  6. 13. Total
  7. 15. ppb
  8. 16. use for logical conjunction
  9. 17. ppm
  10. 18. []
Down
  1. 1. division/fraction
  2. 2. both minus and plus operation
  3. 3. Multiplication (*)
  4. 4. %
  5. 6. approximate
  6. 10. addition
  7. 12. Subtraction
  8. 14. inequality
  9. 15. Decimal point
  10. 19. √