Math

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Across
  1. 5. -10+15
  2. 6. All whole numbers, their opposites and 0
  3. 7. The distance of a number is from 0
Down
  1. 1. A number less than zero
  2. 2. A number greater than zero.
  3. 3. |-20|+0
  4. 4. Numbers that are the distance from zero