Addition and subtraction problems

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Across
  1. 2. 3+3
  2. 3. 1+0
  3. 4. 10-2
  4. 6. 5+5
  5. 7. 5+4
  6. 8. 5-1
Down
  1. 1. 1+1
  2. 2. 9-2
  3. 5. 7+3
  4. 6. 7-4