Negative integers, rationals and real numbers
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RATIONAL , doing the same program .
To any set that contains it! It belongs to {sqrt(30)}, or {45, sqrt(30), pi, -3/7}, or irrational numbers, or real numbers between -6 and 6, or all real numbers or complex numbers, etc.
30 belongs to the set of natural numbers
To any set that contains it! It belongs to {30}, or {45, sqrt(2), 30, pi, -3/7}, or all whole numbers between 23 and 53, or multiples of 5, or square roots of 900, or composite numbers, or counting numbers, or integers, or rational numbers, or real numbers, or complex numbers, etc.
30 is not a ratio. In a ratio, two numbers are always specified, for example, 30:1. If that's what you mean, you can simply multiply both numbers - in this case, 30 and 1 - by any real number (both by the same real number), to get an equivalent ratio.