Numbers

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123456789
Across
  1. 5. nine plus nine
  2. 7. one plus two
  3. 8. ten plus six
  4. 9. eight plus three
Down
  1. 1. six plus eight
  2. 2. fifteen plus five
  3. 3. four plus nine
  4. 4. three plus four
  5. 6. one plus zero