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.