Real number system

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Across
  1. 2. Numbers that cannot be expressed as a simple fraction; their decimal expansions are non-repeating and non-terminating.
  2. 4. All numbers that can be found on the number line, including both rational and irrational numbers.
Down
  1. 1. Numbers that can be expressed as the quotient or fraction of two integers, where the denominator is not zero.
  2. 3. Whole numbers and their opposites (negative numbers), including zero.