A. Basic Math Symbol

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Across
  1. 2. exponent
  2. 5. <
  3. 7. remainder calculation
  4. 8. ppb
  5. 9. ÷
  6. 11. -
  7. 13. equal sign
  8. 14. one of multiplication symbol
  9. 15. minus sign represent
  10. 16. ≠
  11. 17. +
  12. 18. ppt
  13. 19. >
Down
  1. 1. ppm
  2. 2. both minus and plus operation
  3. 3. both plus and minus operation
  4. 4. decimal point, decimal separator
  5. 6. ×
  6. 10. calculate expression inside first
  7. 12. indicates a number or ratio as fraction of 100