Repeating Decimal To Fraction - Steps Of Conversion, Tricks, Examples

Repeating Decimal to Fraction

It is very easy to convert a terminating decimal to a fraction, but how do we convert a repeating decimal to fraction? Repeating decimals are decimal numbers that do not terminate after a finite number of digits and in these numbers, one or more digits repeat themselves again and again. For example 34.56565656... Repeating decimal to fraction conversion can be done by following some simple steps given below.

1.	How to Convert Repeating Decimal to Fraction?
2.	Repeating Decimal to Fraction Trick
3.	Repeating Decimal to Fraction Chart
4.	FAQs on Repeating Decimal to Fraction

How to Convert Repeating Decimal to Fraction?

Repeating or recurring decimals are those decimal expansions that do not terminate or end after a specific number of digits. Such numbers have an infinite number of digits after the decimal point. And there is a repetitive pattern in those digits.

Generally, decimal numbers can be converted to fractions by dividing the number with a power of 10 which is equal to the number of decimal places. For example, 1.5 = 15/10 = 3/2. But with repeating decimals, it is impossible to count the number of decimal places as it is infinite. So, there are some specific steps to be followed to convert repeating decimal to fraction. The repeating decimal to fraction steps of conversion are given below:

• Step 1: Identify the repeating digits in the given decimal number.
• Step 2: Equate the decimal number with x or any other variable.
• Step 3: Place the repeating digits to the left of the decimal point by multiplying the equation obtained in step 2 by a power of 10 equal to the number of repeating digits. This way you will get another equation.
• Step 4: Subtract the equation obtained in step 2 from the equation obtained in step 3.
• Step 5: Simplify to get the answer.

Let us take an example to understand the conversion of repeating decimal to fraction in a better way. Convert 0.77777... to a fraction.

Step 1: We can observe that 7 is repetitive in the given decimal number.

Step 2: Let x = 0.7777...

Step 3: There is only 1 repetitive digit, so multiply this equation by 10. We get, 10x = 7.7777...

Step 4: Subtract x = 0.7777... from 10x = 7.7777... We will get 9x = 7.

Step 5: x = 7/9. Therefore, 0.7777... = 7/9.

When we consider the conversion of repeating decimal to fraction, there are two types of repeating numbers that come up. Those are given below:

• Numbers with only repeating digits, for example, 0.222..., 0.999..., 0.787878..., etc.
• Numbers with multiple digits, for example, 2.7646464..., 98.735735735..., etc

We have already discussed how to convert the first type of repeating decimals to fractions. Now, let us convert a multi-digit repeating decimal to fraction. Convert 3.989898... to a fraction.

Step 1: The repeating digits in the given decimal number are 98.

Step 2: Let x = 3.989898...

Step 3: Since there are two repeating digits, multiply the above equation by 100. We will get, 100x = 398.989898...

Step 4: Subtract x = 3.989898... from 100x = 398.989898... We will get 99x = 395.

Step 5: x = 395/99. Therefore, 3.989898... = 395/99.

Let us take one more example in which we would need to make three equations in order to convert the number to a fraction. Convert 2.7646464... to a fraction.

Let us first equate it to a variable, x. So, x = 2.7646464... Now, the repeating digits are 64. So, let us multiply this equation by 10 such that we will have repeating digits after the decimal point. It implies, 10x = 27.6464...

10x = 27.6464... (equation 1)

Now, let us multiply x = 2.7646464... by 1000 so that we will have decimal point to the right of the repeating digits.

1000x = 2764.6464... (equation 2)

Subtract equation 1 from equation 2, we will get,

1000x - 10x = (2764.6464...) - (27.6464...)

990x = 2737

x = 2737/990

Therefore, 2.7646464... = 2737/990.

Repeating Decimal to Fraction Trick

An easy trick to convert a repeating decimal to the fraction form is to write the repeating digits as the numerator over the same number of 9s. Some examples of repeating decimal to fraction are given below:

1. 0.444... = 4/9 (as there is only 1 repeating digit 4, so only one 9 will come in the denominator)
2. 0.787878... = 78/99 (as there are 2 repeating digits 7 and 8, so two times 9, i.e 99 will come in the denominator)
3. 0.999... = 9/9 = 1

Note that this trick is only applicable for repeating decimals with only the repeating digits. There should not be any other digit present in the given number. In that case, we need to use the repeating decimal to fraction steps of conversion explained above.

Repeating Decimal to Fraction Chart

A repeating decimal to fraction chart will help you to get the fractional values of some commonly used repeating decimals. You can try to convert the repeating decimals (written on the left) to fractions and then use the chart below to verify your answers.

Related Articles

Check these interesting articles related to the concept of repeating decimal to fraction in math.

• Convert Decimal to Fraction
• Recurring Decimal
• What is 0.6 repeating as a Fraction?
• What is 0.4 repeating as a fraction?
• What is 0.3 repeating as a Fraction?