Basic Math Symbol

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Across
  1. 7. ppt
  2. 10. /
  3. 11. -
  4. 14. power; caret
  5. 15. not equal sign
  6. 16. +
  7. 17. <
  8. 19. both minus and plus
Down
  1. 1. *
  2. 2. ppb
  3. 3. both plus and minus
  4. 4. x
  5. 5. ÷
  6. 6. calculate the expression first;()
  7. 7. ppm
  8. 8. []
  9. 9. >
  10. 12. decimal separator
  11. 13. mod
  12. 18. ≈
  13. 20. %