HOW TO CONVERT A DECIMAL TO A FRACTION

Two types of decimals are :

 Terminating decimal

Non Terminating and Recurring Decimal

A decimal which ends with countable number of digits is known as terminating decimal.

For example, 

0.25, 0.5, ............... etc

Non terminating decimal means, it will not end up with any number. 

For example,

0.525252..............

0.125125..............

How to convert a terminating decimal to a fraction ?

To convert a terminating decimal to fraction, we have to follow the steps given below.

Step 1 :

First count the number of digits after the decimal point.

Step 2 :

By multiplying by 10, 100, 1000, ......... etc, we may get rid of the decimal point.

Fro example, if we have only two digits after the decimal point, we have to multiply both numerator and denominator by 100.

Step 3 :

If it is possible, we may simplify the numerator and denominator separately.

How to convert a non terminating recurring decimal to a fraction ?

To know, how to convert a non-terminating recurring decimal to fraction, 

Please click here

Solved Examples

Convert the following decimals to fractions in the form p/q, where p and q are integers and q ≠ 0.

Example 1 :

0.35

Solution :

Number of digits after the decimal point is 2.

So, we have to multiply both numerator and denominator by 100.

0.35 x (100/100)  =   35/100

We may simplify both numerator and denominator by 5 times table.

  =  7/20

Example 2 :

2.176

Solution :

Number of digits after the decimal point is 3.

So, we have to multiply both numerator and denominator by 1000.

2.176 x (1000/1000)  =   2176/1000

We may simplify both numerator and denominator

  =  1088/500

=  544/250

=  272/125

Example 3 :

0.33333.............

Solution : 

Let x  =  0.3333...........  (1)  

Number of digits in the repeating pattern is 1. That is 3.  

Because there is only one digit in the repeating pattern, multiply both sides of (1) by 10. 

10x   =  3.333.........  (2)

(2) - (1)  ==> 

10x - x  =  3.333.........00

9x  =  3

Divide each side by 9. 

x  =  3/9

x =  1/3

Example 4 :

0.6868.........

Solution : 

Let x  =  0.6868...........  (1)  

Number of digits in the repeating pattern is 2. That is 68.  

Because there are two digits in the repeating pattern, multiply both sides of (1) by 100. 

100x  =  68.6868...............  (2)

(2) - (1)==> 

100x - x  =  68.6868.........0

99x  =  68

Divide each side by 99.

x  =  68/99

Example 5 :

32.03256256256..........

Solution : 

Let x  =  32.03256256256.............

Here, the repeated pattern is 256

No. of digits between the 1st repeated pattern and decimal is 2.

So, multiply the given decimal by 100. Then, we have

100x  =  3203.256256256...............(1) 

No. of digits between the 2nd repeated pattern and decimal  =  5

So, multiply the given decimal by 100000. Then, we have

100000x  =  3203256.256256256...............(2)

Subtracting (1) from (2), we get

(2) - (1) ===>

99900x  =  3200053

x  =  3200053/99900

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