Question

How do you convert $2.1\overline{36}$ as a fraction?

Answer 1

Hint: We first describe the concept of representation of non-terminating recurring decimal. We describe the process of converting them from decimal to fractions. Following those steps, we convert $2.1\overline{36}$ to a fraction. To understand the process better we also take an example of another complicated form and change that decimal into fraction.

Complete step-by-step answer:
The given decimal number is a representation of non-terminating recurring decimals. These types of decimal numbers are rational numbers. They can be expressed in the form of $\dfrac{p}{q}$.
The expansion of the given decimal is $2.1\overline{36}=2.1363636........$
The process of converting into fraction form is below mentioned.
Step: 1
We have to find the numerator part of the fraction where we take the difference between the whole number without decimal point and the non-recurring part of the number without decimal point.
Step: 2
We have to find the denominator part of the fraction where we take the digits of 9 and 0. The number of digits of 9 is equal to the number of recurring digits in the given number after decimal and the number of digits of 0 is equal to the number of non-recurring digits in the given number after decimal. The 9s come first and the zeroes come after that.
Now we find the fraction form of $2.1\overline{36}$ applying the rules.
$2.1\overline{36}=\dfrac{2136-21}{990}=\dfrac{2115}{990}=\dfrac{47}{22}$.
The fractional value of $2.1\overline{36}$ is $\dfrac{47}{22}$.

Note: To understand the process better we take another example of $2.45\overline{74}$.
The fractional form of the decimal form will be $2.45\overline{74}=\dfrac{24574-245}{9900}=\dfrac{24329}{9900}$.
There are two recurring and two non-recurring digits in that number after decimal. That’s why we used two 9s and two 0s in the denominator.