number system

123456789101112
Across
  1. 3. A non-repeating, non-terminating decimal expansions
  2. 5. Any number which is not a rational number
  3. 8. The decimal expansion of a rational number can be
  4. 11. The result of multiplying a number by itself
  5. 12. Any non-negative integer i.e. 0, 1, 2, 3,...
Down
  1. 1. The sign of integers less than zero
  2. 2. Numbers that can be written in the form a/b, where a and b are both integers, and b is not zero
  3. 4. The set of positive and negative numbers, including zero
  4. 6. The set of all the rational and irrational numbers together
  5. 7. A number that has three or more factors
  6. 9. The set of counting numbers starting from 1
  7. 10. A number with only two factors, 1 and itself