Basic Math Symbol

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Across
  1. 1. decimal separator
  2. 3. []
  3. 4. both plus and minus
  4. 7. *
  5. 8. ppt
  6. 9. both minus and plus
  7. 14. +
  8. 15. ppm
  9. 16. ÷
  10. 17. power; caret
  11. 18. calculate the expression first;()
Down
  1. 1. %
  2. 2. <
  3. 5. ppb
  4. 6. x
  5. 9. mod
  6. 10. ≈
  7. 11. /
  8. 12. -
  9. 13. >