Real number system

1234
Across
  1. 2. What do 0,1,2,1, -2 and -3 all have in common?
  2. 3. What are the numbers you can count physically, like 1,2,3...?
  3. 4. What kind of numbers are ¼, ⅗ and ⅓?
Down
  1. 1. What does the letter w stand for, and what do the numbers o,1,2 and 3 also go into?
  2. 2. What is it called when the decimal keeps going, for example √0.0123,√9?