Easy math

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Across
  1. 2. it's one plus zero
  2. 4. it's 20 minus seven
  3. 7. it's a hundred minus a hundred
  4. 9. it's greater than ninety-nine
Down
  1. 1. it's greater than three and two
  2. 3. it's six plus four
  3. 5. it's 8 minus six
  4. 6. it's ten plus one
  5. 8. it's smaller than four