Algebra puzzle

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Across
  1. 1. the amount of variables in a term
  2. 4. terms that can't be simplified
  3. 6. any number of terms
  4. 8. a three term expression
  5. 12. the number above the fraction
  6. 13. the number that remains the same
  7. 14. the end result of multiplication
Down
  1. 1. what you get after subtracting
  2. 2. what you get when you add
  3. 3. the number under the fraction
  4. 5. a two term expression
  5. 7. terms that can be simplified
  6. 9. a single term
  7. 10. the end result of division
  8. 11. an unknown number represented by a letter