real numbers

123456
Across
  1. 4. includes the set of all numbers that can be expressed as fractions in the form a/b where a and b are integers and b does not equal zero (1/2, 0.5, √25)
  2. 5. the set of natural numbers and zero (0,1,2,3,4...)
  3. 6. the set of counting numbers (1,2,3,4,5...)
Down
  1. 1. the set of all nonrepeating, nonterminating decimals. An irrational number cannot be written in fraction form (√2,π)
  2. 2. the set of whole numbers and their opposites (....-3, -2, -1, 0, 1, 2, 3...)
  3. 3. the set of counting numbers.