Examples

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Across
  1. 3. per-trillion
  2. 5. than <
  3. 8. ×
  4. 13. modulo
  5. 14. ()
  6. 16. %
  7. 17. sign =
  8. 18. minus sign
  9. 19. root √a•√a=a
  10. 20. ÷
Down
  1. 1. []
  2. 2. sign ÷
  3. 4. decimal point
  4. 6. -
  5. 7. inequality >
  6. 9. per-million
  7. 10. greater than
  8. 11. *
  9. 12. root 3√a
  10. 15. exponent
  11. 16. per-billion