# How to Tell That a Number Is Rational?

The easiest way to tell if a number is rational or not is to attempt to express it as a fraction. If you can, then the number is rational. If not, then the number is irrational. According to Math I...
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http://www.ehow.com/how_8334976_tell-number-rational.html

## What does it mean for a number to be rational?

A rational number is any number that can be expressed by a simple fraction. Four, for example, is written as 4/1; 0.75 is 3/4. Numbers that can't be turned into simple fractions are irrational. Wit...
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http://www.answerbag.com/q_view/2082518

## Is 0 a rational number?

Yes. A rational number is any number that can be expressed as a whole number, fraction or mixed number. Zero can be expressed as "0" or "zero," or as a fraction such as 0/2. Pi is an example of an ...
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http://www.answerbag.com/q_view/2110011

## Is 40 a rational or irrational number?

The number 40 is a rational number. According to Wolfram Research's Math World, a rational number is any number that can be expressed as the ratio of two integers. The integers are represented by a...
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http://www.answerbag.com/q_view/2240510

## How to Tell if a Number Is a Rational Decimal?

A rational number is a number that is nameable -- that is, something easily stated and identified. It can be a whole number, a mixed number, a fraction and a decimal. Rational decimals are numbers ...
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http://www.ehow.com/how_8234477_tell-number-rational-decimal.html