Math crossword puzzle

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Across
  1. 2. to become progressively greater(size, amount, number)
  2. 4. A factor shared by two or more numbers
  3. 8. an unknown numerical value
  4. 9. the part of a fraction that is below the line
  5. 12. taking one number away from the other
  6. 13. The two- dimensional space taken up by an object or shape, given in square units
  7. 14. the act of combining numbers
  8. 15. the part of the fraction that is above the line
Down
  1. 1. value of a number that never changes
  2. 3. A letter or number representing a numerical quantity attached to a term.
  3. 5. becoming fewer or less(size, amount, number)
  4. 6. The ordered pair that gives a precise location or position on a coordinate plane.
  5. 7. adding equal groups
  6. 10. splitting into equal parts or groups
  7. 11. the result of adding