Basic math symbol

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Across
  1. 3. ppm
  2. 6. ppb
  3. 11. division/ fraction
  4. 12. ‰
  5. 13. to show where something is to be inserted into text
  6. 15. Multiplication (*)
  7. 18. approximate
  8. 19. Subtraction
  9. 20. Remainder calculation
Down
  1. 1. Total
  2. 2. ppt
  3. 4. equality
  4. 5. both minus and plus operation
  5. 7. [ ]
  6. 8. Calculate expression inside
  7. 9. inequality
  8. 10. Less that or equal to
  9. 14. Decimal point
  10. 16. ✓
  11. 17. %