Expressions and equations

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