Expressions and equations

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Across
  1. 3. a sign that represents a number or letter
  2. 4. any distinct quantity contained in a
  3. 9. a calculation by mathematical methods
  4. 11. any natural number or its negative, or zero
  5. 12. a calculation by mathematical methods
  6. 13. the mathematics of generalized arithmetical operations
  7. 16. notation of how many times to multiply a quantity by itself
  8. 17. a mathematical statement that two expressions are the same
  9. 18. a number representing a quantity with a fixed value
  10. 19. a numerical quantity measured or assigned or computed
  11. 20. a constant number that serves as a measure of some property
Down
  1. 1. a group of symbols that make a mathematical statement
  2. 2. greater than 0
  3. 5. being essentially comparable to something
  4. 6. a symbol that is used in mathematical or logical expressions
  5. 7. notation of how many times to multiply a quantity by itself
  6. 8. the quotient of two rational numbers
  7. 10. less then 0
  8. 14. notation indicating a quantity multiplied by itself rational an integer or the quotient of two integers
  9. 15. a number in a system based on ten