 # Quick Answer: Is Root 21 A Rational Number?

## Is a root a rational number?

Not all square roots are whole numbers.

Many square roots are irrational numbers, meaning there is no rational number equivalent..

## Is the square root of 2 3 a rational number?

Explanation: A number that can be written as a ratio of two integers, of which denominator is non-zero, is called a rational number. As such 23 is a rational number. 23 is a rational number.

## Is 6 a real number?

These are the set of all counting numbers such as 1, 2, 3, 4, 5, 6, 7, 8, 9, ……. ∞. Real numbers are the numbers which include both rational and irrational numbers. Rational numbers such as integers (-2, 0, 1), fractions(1/2, 2.5) and irrational numbers such as √3, π(22/7), etc., are all real numbers.

## Is 21 a rational numbers?

Answer and Explanation: The number 21 is a rational number. It is an integer, or whole number, and all integers are rational numbers.

## What is the value of 2 Root 21?

How to find the value of 2 root 21 ??? First find out the square root of 21 by long division method. That would be around 4.58257569495584. And then just simply multiply it with 2.

## Is 0 a rational number?

Zero Is a Rational Number As such, if the numerator is zero (0), and the denominator is any non-zero integer, the resulting quotient is itself zero.

## How do you find the root of 21?

√21=√3⋅7 has no square factors that can be ‘moved outside the square root sign’. So √21 cannot be simplified. It cannot be expressed as a rational number (fraction), so the best we can do with normal notation is to either stick with √21 or give an approximation, such as √21≈4.58 .

## Is √ 3 an irrational number?

The square root of 3 is the positive real number that, when multiplied by itself, gives the number 3. It is more precisely called the principal square root of 3, to distinguish it from the negative number with the same property. It is denoted by √3. The square root of 3 is an irrational number.

## Is Root 23 a rational number?

23 is not a perfect square values so that, it is an irrational number. The decimal expansion of above number is terminating, so that it is a rational number. The decimal expansion of above number is non-terminating recurring, so that, it is a rational number.

## Is Root 21 rational or irrational?

Therefore 21≠a2 , so a≠√21 , meaning that our earlier assumption of √21 being rational turns out to be wrong, therefore √21 is irrational.

## What is the under root of 21?

Table of Squares and Square RootsNUMBERSQUARESQUARE ROOT193614.359204004.472214414.583224844.69096 more rows

## Is 2/3 an irrational number?

For example 3=3/1, −17, and 2/3 are rational numbers. … Most real numbers (points on the number-line) are irrational (not rational). The rational numbers are those which have repeating decimal expansions (for example 1/11=0.09090909…, and 1=1.000000…

## Is 21 a perfect square?

A: No, the number 21 is not a perfect square.

## Is the square root of 72 rational?

The square root of 72 is a rational number if 72 is a perfect square. It is an irrational number if it is not a perfect square. Since 72 is not a perfect square, it is an irrational number.

## Is 2.5 a rational number?

Answer and Explanation: The decimal 2.5 is a rational number. All decimals can be converted to fractions. The decimal 2.5 is equal to the fraction 25/10. By definition, a…