basic math symbols

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Across
  1. 5. calculate expression inside first
  2. 6. root
  3. 10. less than or equal to
  4. 14. approximately equal
  5. 15. _
  6. 16. equal sign
  7. 19. decimal point
  8. 20. plus sign
Down
  1. 1. minus sign
  2. 2. exponent
  3. 3. calculate expression inside first
  4. 4. minus sign
  5. 7. obelus
  6. 8. %
  7. 9. times sign
  8. 11. period
  9. 12. power
  10. 13. exponent
  11. 17. multiplication
  12. 18. remainder calculation