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Because it can be expressed as a fraction in the form of 2/5 in its simplest form

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Q: Why is 0.4 considered a rational number?
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Related questions

Is 7 12 a rational number?

yes it is considered as a rational number


Is a decimal a considered a real number and a rational number?

Decimals are real. They can be rational or irrational.


Why 0 is rational number?

because it does not value Zero is considered rational because it can still be expressed as a fraction


Are all fractions considered a rational number?

Yes - the word rational in this case means "can be written as a ratio".


Is 100 percent a rational number?

Yes, 100 percent is considered to be a rational number. The reason it is, is because it can be expressed as the quotient or fraction of two integers.


Why decimal is considered as rational number?

A decimal need not be a rational. A non-terminating, non recurring decimal is an irrational number. Only a terminating decimal or a recurring decimal is rational and that is because such a number can be expressed as a ratio of two integers.


Why the rational number 10 is also a whole number?

Because 10 has no fractional part; it is considered a whole number.


Is 3.456 a rational or irrational number?

It is a rational number. It can be written as a fraction.


Is the product of a rational number and a rational number a rational number?

yes


Is 17.02 a rational number?

Is 12.05 a rational number or irrational number?


Is 1.96 a rational number or an irrational number?

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If it doesn if a decimal doesn't terminate or repeat is it still a rational number or not?

No, if a decimal does not terminate or repeat, it is not a rational number. Rational numbers can be expressed as a ratio of two integers, and their decimal representation either terminates or repeats after a certain point. Decimals that do not have a pattern and continue indefinitely are considered irrational numbers.