Quandale Dingle does math

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Across
  1. 2. person or thing that is totally different from or the reverse of someone or something else
  2. 4. terminating decimal is a decimal, that has an end digit
  3. 5. rational number
  4. 7. arrangement or disposition of people or things in relation to each other according to a particular sequence, pattern, or method
  5. 10. value the magnitude of a real number without regard to its sign
  6. 11. sentence with a minimum of two numbers or variables
  7. 12. an answer to, explanation for
Down
  1. 1. number without fractions; an integer
  2. 3. whole number; a number that is not a fraction
  3. 6. inverse a number that when added to a given number gives zero
  4. 8. statement that the values of two mathematical expressions are equal
  5. 9. diagram that represents the variation of a variable in comparison with that of one or more other variables