Real Number System

123456
Across
  1. 4. a smaller group of numbers that is part of a bigger group of numbers
  2. 5. the set of all positive counting numbers starting with 1
  3. 6. written as a fraction, terminating/repeating decimal, or square root of perfect square
Down
  1. 1. the set of whole numbers and their opposites
  2. 2. cannot be written as a fraction, non-terminating/non-repeating decimal, or square root of non-perfect square
  3. 3. the set of all positive counting numbers starting with 0