Q: To which subsets of the real numbers does the number 1.68 belong?

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Rational numbers, whole numbers, negative numbers, even numbers, integers

Only a set can have subsets, a number such as -2.38 cannot have subsets.

There are infinitely many subsets of real numbers. For example, {2, sqrt(27), -9.37} is one subset.

The rational numbers are a subset of the real numbers. You might recall that rational numbers are those that can be expressed as the ratio of two whole numbers (no matter how large they are). Irrational numbers, like pi, cannot. But both sets (the rational and irrational numbers) are subsets of the real numbers. In fact, when we look at all the numbers, we are looking at the complex number system. We break that down into the real and the imaginary numbers. And the real numbers have the rational and irrational numbers as subsets. It's just that simple.

An irrational number is a number that can't be expressed by a fraction having integers in both its numerator and denominator. A rational number can be.

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Integers, Rational numbers, Real numbers and Complex numbers.

Rational numbers.

The one which says rational numbers (ℚ).

Rational numbers, whole numbers, negative numbers, even numbers, integers

Only a set can have subsets, a number such as -2.38 cannot have subsets.

It belongs to the interval (25, 27.3), or [-20.9, 10*pi], and infinitely more such intervals.It also belongs to the set of rational numbers, real numbers, complex numbers and quaternions.

Real numbers; rational numbers; integers; and of course you can make up lots of other sets to which it belongs.

The two main DISJOINT subsets of the Real numbers are the rational numbers and the irrational numbers.

To any set that contains it! It belongs to {-22}, or {-22, sqrt(2), pi, -3/7}, or all whole numbers between -43 and 53, or multiples of 11, or composite numbers, or integers, or rational numbers, or real numbers, etc.

Real number set, imaginary number set, and their subsets.

There are infinitely many subsets of real numbers. For example, {2, sqrt(27), -9.37} is one subset.

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.