Crossword

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1234
Across
  1. 3. Whole Numbers with their opposites {-1, -2, -3, ...} and Zero
  2. 4. Numbers AKA as Counting Numbers
Down
  1. 1. 1,2,3,4,5,6,7,8,9,10...ECT
  2. 2. can be written as the ratio of two integers.