Addition and Subtraction

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Across
  1. 1. 8 - 6 = ?
  2. 3. 3 + 3 = ?
  3. 4. 4 + 6 = ?
  4. 6. 4 + 5 = ?
  5. 7. 7 - 2 = ?
  6. 8. 1 + 2 = ?
Down
  1. 2. 9 - 8 = ?
  2. 3. 4 + 3 = ?
  3. 5. 5 + 3 = ?
  4. 7. 6 - 2 = ?