Addition Mystery

Edit Answers
123456
Across
  1. 2. 8000-2,683
  2. 4. 30+8
  3. 5. 10,000-5386
  4. 6. 57700+38
Down
  1. 1. 500-165
  2. 3. 6000-337
  3. 4. 800+8
  4. 5. 600-86