7.N.S crossword puzzle

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Across
  1. 2. a pair of number whose sum is zero
  2. 4. the distance a number is from on a number line
  3. 6. the answer to a subtraction problem
  4. 7. the opposite of a number
  5. 10. a grouping symbol
  6. 12. the answer to a division problem
Down
  1. 1. a tool that represents numbers as points on a line
  2. 3. the set of a whole number and their opposites
  3. 5. two number with the same absolute value but different signs
  4. 8. indicates how many times to use the base as a muliplier
  5. 9. the answer to a multiplication problem
  6. 11. the answer to an addition problem