ADDITION AND SUBTRACTION

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Across
  1. 1. 8954 - 3628
  2. 3. 7234 - 2536
  3. 6. 9237 - 5815
  4. 8. 236 + 549
Down
  1. 2. 6539 - 356
  2. 4. 5861 + 654
  3. 5. 672 + 581
  4. 7. 4746 + 184