Converting a Fraction to a Terminating Decimal - Basic

A terminating decimal is a decimal that ends. In other words, a terminating decimal doesn t keep going. It has a finite number of digits after the decimal point.

$frac{2}{5} = 0.4;: frac{2}{4} = 0.75;: frac{25}{16} = 1.5625$

In the examples shown above, we have few fractions expressed as decimals. Notice that these decimals have a finite number of digits after the decimal point. So, these are terminating decimals.

Rule to convert a fraction to a terminating decimal

To convert a fraction into a terminating decimal, the method is to set up the fraction as a long spanision problem to get the answer.

Here we are converting proper fractions into terminating decimals.

Convert $frac{3}{4}$ into a decimal.

Solution

Step 1:

At first, we set up the fraction as a long spanision problem, spaniding 3 by 4

Step 2:

We find that on long spanision $frac{3}{4} = 0.75$ which is a terminating decimal.

OR

Step 3:

We write an equivalent fraction of $frac{3}{4}$ with a denominator 100.

$frac{3}{4} = frac{left ( 3 imes 25 ight )}{left ( 4 imes 25 ight )} = frac{75}{100}$

Step 4:

Shifting the decimal two places to the left we get

$frac{75}{100} = frac{75.0}{100} = 0.75$

Step 5:

So, $frac{3}{4} = 0.75$ which again is a terminating decimal.

Convert $frac{23}{25}$ into a decimal.

Solution

Step 1:

At first, we can set up the fraction as a long spanision problem, spaniding 23 by 25

Step 2:

We find that on long spanision $frac{23}{25} = 0.92$ which is a terminating decimal

OR

Step 3:

We write an equivalent fraction of $frac{23}{25}$ with a denominator 100.

$frac{23}{25} = frac{left ( 23 imes 4 ight )}{left ( 25 imes 4 ight )} = frac{92}{100}$

Step 4:

Shifting the decimal two places to the left we get

$frac{92}{100} = frac{92.0}{100} = 0.92$

Step 5:

So, $frac{23}{25} = 0.92$