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It isn't always possible to determine. For example, it is unknown whether the Euler-Mascheroni constant (0.5772156649...) is rational or irrational.
Most famous numbers and constants are known to be rational or irrational. If it can be expressed as a fraction a/b where a and b are integers, it's rational.
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Earn +20 ptsQ: How do you determine a rational or irrational number?
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How can you determine whether the square root of a number is a rational number or an irrational number?
If it can't be expressed as a fraction then it is an irrational number
How do you determine if eleven out of twenty is a rational or irrational number?
All whole numbers are rational. Any rational number divided by another (non-zero) rational number is a rational number.
When an irrational number is divided by a rational number is the quotient rational or irrational?
Irrational.
What is the product of rational and irrational number?
The product of a rational and irrational number can be rational if the rational is 0. Otherwise it is always irrational.
When you multiply an irrational number by a rational number will the answer always be irrational rational or both?
It will be irrational.
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