addition and subtration

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Across
  1. 4. six minus one
  2. 5. twenty-two plus two
  3. 7. four plus five
  4. 8. ten plus one
  5. 9. seventeen plus two
Down
  1. 1. eleven plus eleven
  2. 2. sixteen minus one
  3. 3. four plus three
  4. 6. fifteen minus one