Any number that can be written as a ratio of two integers

Rational number

Step-by-step explanation:

Any number that can be written as a ratio of two integers is a rational number.

In the question, you have the keyword 'ratio', meaning a comparison between two numbers.  For example 1.5 can be expressed as the ratio between 3 and 2 (3/2), as a fraction.

When a number cannot be expressed as a fraction, it's called an irrational number. The most famous irrational number of all would be pi (π). You cannot express pi in a ratio between numbers, because it's  too complicated, it's basically an infinite number without any periodicity.

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