Numbers

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12345678910
Across
  1. 3. Sixteen minus three
  2. 5. Nine plus nine
  3. 6. Eighteen minus two
  4. 7. Nine plus five
  5. 9. Twenty minus one
  6. 10. Fourteen plus six
Down
  1. 1. Eight plus seven
  2. 2. Thirteen plus four
  3. 4. Ten plus one
  4. 8. Six plus six