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

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