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Rational numbers

A rational number, or fraction, is any number that can be written as the ratio of two integers.

$$2$$, $$-2/5$$ and $$3.1$$ are rational numbers. $$3.1$$ is a rational number because it can be written as the ratio $$31/10$$.

All integers are rational numbers. For example, $$5$$ can be written as the ratio $$5/1$$.

Examples of numbers that are not rational are $$\sqrt{2}$$, $$\pi$$, or the cube root of $$2$$.

The symbol for the set of the rational numbers is $$\mathbb{Q}$$.

Basic operations on rational numbers (addition, subtraction, multiplication and division) always give a rational number.

All integers are rational numbers.
All integers are rational numbers.