Integer crossword puzzle

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1234567
Across
  1. 4. this is always non negative
  2. 5. to separate into portions
  3. 6. what is used to complete a problem
  4. 7. a not positive number
Down
  1. 1. increase greatly in number
  2. 2. another word for negative numbers.
  3. 3. a not negative number
  4. 4. to make more of