There are no "the" 5 rational numbers. There are infinitely many of them and, while 0 and 1 have special status (as the additive and multiplicative identities), in mathematical terms the rest have the same status and so there are no others which are more important.
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No. Rational numbers are those numbers that can be expressed as a ratio of two integers. 2.4, for example, is a rational number (it can be written as the ratio 12/5), but not a counting number.
-5 is an integer and a rational number. Integers can be positive or negative. Rational numbers can be expressed as a fraction of integers.
The quotient of 5 and negative 30 is both. Rational numbers and integers include many of the same numbers. Integers are positive and negative counting numbers, but rational numbers include nonrepeating decimals and fractions.
rational
Yes, it can be expressed as a ratio of two integers: -1086 / 10 or -543/5