Addition and Subtraction

12345678
Across
  1. 1. 1,386+1,957
  2. 4. 987+53
  3. 6. 637+174
  4. 7. 32687-30498
  5. 8. 878+976
Down
  1. 1. 6400-2891
  2. 2. 7586-3425
  3. 3. 6891+4008
  4. 5. 5078-1893
  5. 7. 6245-3758