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Rational Numbers

Rational numbers are integers plus fractions.

In other words number is rational, if it can be written as fraction $\frac{{p}}{{q}}$ (we know that every integer ${m}$ can be written as fraction $\frac{{m}}{{1}}$ ).

So, -4, -10, 0, 2, 23, $-\frac{{4}}{{5}}$ , $-{3}\frac{{2}}{{5}}$ , $-\frac{{15}}{{7}}$ , $\frac{{2}}{{3}}$ , $\frac{{9}}{{4}}$ , ${5}\frac{{10}}{{11}}$ are all rational numbers.

Thus, rational numbers include

integers {..., -5,-4,-3,-2,-1,0,1,2,3,4,5,...}
fractions (proper, improper, mixed numbers)

Set of rational numbers, i.e. group of rational numbers, is denoted by $\mathbb{Q}$ .