Expression puzzle.

1234567891011121314
Across
  1. 3. a symbol used to represent an unknown number
  2. 4. the answer to a subtraction problem
  3. 6. the answer to a division problem
  4. 8. answer to an addition problem
  5. 12. a mathematical phrase containing numbers, letters, and the order of operations, but no equal sign
  6. 13. something that is equal
  7. 14. the answer to a multiplication problem
Down
  1. 1. the number that you multiply when you use an exponent
  2. 2. terms that have the same variable with the same exponent on each variable.
  3. 4. able to distribute
  4. 5. making the problem easier to answer
  5. 7. the number in front of the variable
  6. 9. the pieces of a number that are added or subtracted together
  7. 10. a term whose value does not change
  8. 11. repeated multiplication