Camden's puzzle

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Across
  1. 3. to take away
  2. 5. multiply by 4
  3. 7. 3 groups of 9
  4. 10. answer to a subtraction problem
  5. 12. answer to division problem
  6. 13. a thing that says to add
  7. 14. numbers you add
Down
  1. 1. multiply by 2
  2. 2. the answer to an addition problem
  3. 4. multiply by 3
  4. 6. the a multiplication problem
  5. 8. numbers you multiply
  6. 9. to multiply
  7. 11. twice the amount