List the numbers in each set that are (a) Natural Numbers, (b)
Integers, (c) Rational Numbers, (d) Irational Numbers, (e) Real
Numbers:

B= (-5/3, 2.060606...(the block repeats), 1.25, 0, 1, square root of 5

http://mathforum.org/dr.math/faq/faq.integers.html

Natural Numbers: Any positive whole number - 0 is included in some definitions
        0? , 1
Intergers: A whole Number, positive or negative or 0
        0, 1
Rational Numbers: Numbers that can be written as (a) / (b) , where a
and b are intergers
       -5/3 , 2.0606 , 1.25, 0, 1
Irrational Numbers: Numbers that are not rational, but are real
       square root 5
Real Numbers: any number that has a real value - it occupies a point
on a number line
      all of the numbers in the question