Addition & Substraction

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Across
  1. 1. three plus one
  2. 3. twenty minus eight
  3. 4. ten minus one
  4. 6. zero plus one
  5. 8. ten minus two
  6. 10. seven plus three
  7. 11. five minus five
Down
  1. 1. nine minus four
  2. 2. five plus two
  3. 5. six plus five
  4. 7. four plus two
  5. 9. seven minus four
  6. 10. eight minus six