Addition and subtraction keywords

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Across
  1. 1. Addition keyword starting with an "a"
  2. 4. subtraction keyword starting with an "F"
  3. 6. subtraction keyword starting with a "L"
  4. 10. Addition keyword starting with an "c"
  5. 11. subtraction keyword starting with a "c"
  6. 13. subtraction keyword starting with a "D"
  7. 14. Addition keyword starting with an "p"
Down
  1. 2. subtraction keyword starting with a "D"
  2. 3. Addition keyword starting with an "m"
  3. 5. Addition keyword starting with an "t"
  4. 7. Addition keyword starting with an "s"
  5. 8. Addition keyword starting with an "i"
  6. 9. subtraction keyword starting with a "M"
  7. 12. subtraction keyword starting with a "L"