Basic math simble

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