Numbers

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12345678
Across
  1. 2. two+four
  2. 3. three+six
  3. 4. seven-four
  4. 5. three-two
  5. 7. nine-five
  6. 8. nine+one
Down
  1. 1. ten-five
  2. 2. five+two
  3. 4. eight-six
  4. 6. one+seven