The set of rational numbers. 23.8 can be expressed as the fraction 119/5
Real number set, imaginary number set, and their subsets.
They are all subsets of the real number. That is their only common feature. There is little direct relationship between the set of counting numbers and the set S = {pi, sqrt(9.3), 6, -7.5}
Only a set can have subsets, a number such as -2.38 cannot have subsets.
Real number, Rational Number
negative 8
Any set that contains it! It belongs to {0}, or {45, sqrt(2), 0, pi, -3/7}, or all whole numbers between -43 and 53,or multiples of 5, or integers,or rational numbers, or rational numbers smaller than 6.3,or real numbers,or complex numbers, etc.
No, they are disjoint sets. Both are subsets of the Real numbers.
All rational numbers are real so the phrase "real rational" has no meaning. There are an infinite number of subsets: The emply or null set, {1,1.5, 7/3}, {2}, (0.1,0.2,0.3,0.66..., 5.142857142857...} are some examples.
Integers, Rational numbers, Real numbers and Complex numbers.
There are infinitely many subsets of real numbers. For example, {2, sqrt(27), -9.37} is one subset.
The one which says rational numbers (ℚ).
Not necessarily. There are series over all kinds of subsets and supersets of the set of real numbers.