Basic math symbols

1234567891011121314151617181920
Across
  1. 3. the symbol of 1/ppm=1/1000000
  2. 4. 1%=1/100
  3. 6. the symbol name is minus sign
  4. 9. the symbol of per-billion
  5. 11. the symbol of modulo
  6. 12. the defination of not equal sign
  7. 13. the definition of approximately equal
  8. 17. the symbol meaning/definition of power
  9. 18. the symbol is ( )
  10. 20. the symbol name is times sign
Down
  1. 1. the meaning/definition is exponent
  2. 2. the symbol of per-trillion
  3. 5. the remainder calculation
  4. 7. the symbol is ×
  5. 8. the symbol is +
  6. 10. the calculate expression inside first
  7. 14. the symbol is .
  8. 15. the symbol is <
  9. 16. the symbol is ÷
  10. 19. the defination of equals sign