Accentuate the Negative

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Across
  1. 2. a set of whole numbers and their opposites
  2. 7. number stays the same
  3. 8. best student ever
  4. 9. numbers greater than zero
  5. 12. same absolute value
Down
  1. 1. number less than zero
  2. 3. best teacher ever
  3. 4. the order of the numbers does not change the result
  4. 5. numbers that can be expressed as a fraction
  5. 6. numbers that cancel each other out
  6. 10. a set of rules to perform a procedure
  7. 11. distance from zero