intervention

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Across
  1. 3. changing the sign of the number and adding it to the original number to get an answer equal to 0.
  2. 5. Changing the order of addends does not change the sum.
Down
  1. 1. two things differ from each other in such a way as to indicate a definite kind of relationship.
  2. 2. the non-negative value of x without regard to its sign.
  3. 4. A unit of measure is used to measure the magnitude of an angle.