Real Number System

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Across
  1. 3. The set of numbers including both positive and negative whole numbers.
  2. 4. A number that cannot be written as a fraction.
  3. 5. A positive number with no decimal or fraction part.
Down
  1. 1. The set of all numbers that can be written as a fraction.
  2. 2. The largest set that contains all other sets in the system.