Numbers

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123456789
Across
  1. 1. four+four
  2. 3. two+two
  3. 5. six-one
  4. 6. five-two
  5. 7. five+five
  6. 9. five+two
Down
  1. 1. twelve-one
  2. 2. one+one
  3. 4. six+three
  4. 6. six+six
  5. 8. five-four
  6. 9. three+three