Basic Math symbols

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Across
  1. 4. example 2*3=6
  2. 6. for example 5 is equal to 2+3
  3. 7. calculate expression inside first
  4. 9. example 2.3=6
  5. 12. plus sign
  6. 14. for example 4<5 or 4 is less than 5
  7. 15. ppt
  8. 18. example 2-1=1
  9. 19. example 6/2=3
Down
  1. 1. power
  2. 2. both minus and plus operations
  3. 3. 1ppm=1/1000=0.1%
  4. 5. %
  5. 8. division/fraction
  6. 9. remainder calculation
  7. 10. example 2^3=8
  8. 11. decimal point, decimal separator
  9. 13. both plus and minus operations
  10. 16. ppb
  11. 17. example 2x3=6