unit #1

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Across
  1. 4. numbers ,
  2. 7. , a set that is composed entirely of members of some other set
  3. 9. numbers , numbers that can be expressed as the ratio a/b, where "a" and "b" are integers and "b" does not equal zero
Down
  1. 1. numbers , all numbers used for counting objects
  2. 2. numbers , all natural numbers including zero
  3. 3. , positive and negative whole numbers
  4. 5. that can't be expressed as the ratio a/b, where "a" and "b" are integers and "b" does not equal zero
  5. 6. numbers , the set of rational numbers together with the set of irrational numbers
  6. 8. , a group(s) of common attributes