Numbers

12345678
Across
  1. 1. 3+3
  2. 4. four plus four
  3. 5. 6-1
  4. 6. 2
  5. 7. 4+5
  6. 8. 1
Down
  1. 1. 5+2
  2. 2. Nothing
  3. 3. 3
  4. 5. 2+2
  5. 6. five plus five