Rational or Irrational Number Calculator
Select the operator and enter the required values to identify a number using a rational or irrational calculator.
Rational and Irrational
The rational number calculator is online tool that identifies the given number as rational or irrational. It takes numerator and denominator to check a fraction, index value and a number in case of a root value.
Rational or irrational checker tells us if a number is rational or irrational and shows the simplified value of the given fraction.
What is a rational number?
Rational number is a numbers that can be express as the ratio of two integers. Generally, it’s written in the form of p/q where the condition must be q ≠ 0.
For example,
4/5, 2/3
All the integers, whole numbers, even and odd numbers are rational numbers. This is because the integer numbers are considered of having the denominator of 1.
3 = 3/1
What is an irrational number?
An irrational number is a number that cannot express the ratio between two numbers. We can say that the numbers that are not divisible to the simplest form are considered an irrational number.
For example,
√7, 54.72410, π
How to identify a rational and irrational number?
The following conditions should be followed to identify a rational or irrational number.
Conditions for rational number | Conditions for Irrational number |
It is written in the form of “p/q” and the q is not equal to 0 (q ≠ 0). | The square roots that are not perfectly square to any of the integer e.g. √8, √20. |
The p/q value can be further shortened through division and it can be converted into the decimal form | The decimals that don’t stop or repeating are irrational number. |
The set of rational numbers can include the positive, negative integers and a zero where it can be written in the fraction. | “π”, which is also known as the “pie.” |
If you don’t want to dive in these conditions to check a number, use our rational and irrational numbers calculator above.
Is the square root of a number a rational number?
The square root of a number can be a rational or irrational number depends on the condition and the number.
If the square root is a perfect square, then it would be a rational number. On the other side, if the square root of the number is not perfect, it will be an irrational number. i.e., √10 = 3.16227766017.
References:
- Roberts, D. Rational, and Irrational Numbers - MathBitsNotebook(A1 - CCSS Math).
- Classifying numbers: Rational & Irrational | Algebra (video) | Khan Academy.