Having a thourough knowledge of decimals and the place value of the digits in it helps to understand the reasoning behind the methods going to be described here.

Also knowledge of
Long Division is a prerequisite here.

The methods are easy to follow.

But remember that, simple things need perfection and perfection is not a simple thing.

Study the Examples and solve all the problems given in exercise and check with the Answers.

Method of Converting Fractions to Decimals

Simple method : Fractions to Decimals

This method is suitable when the denominator is a power of 10.

This method is simply putting a decimal point in the Numerator by looking at the denominator.

When the denominator is a power of 10, count the number of zeros in it (say 'n'). Then the required decimal is obtained by putting a decimal point in the numerator after 'n' digits from the right. If there are not sufficient number of digits, put zeros.

Examples :

19⁄10 = 1.9

7⁄1000 = .007 = 0.007

234⁄100 = 2.34

56789⁄1000 = 56.789

9786412⁄100000 = 97.86412

Sometimes, we can convert a fraction to an equivalent fraction with denominator, a power of 10. Then, we can apply the simple method.

Examples :

3⁄20 = (3x5)⁄(20x5) = 15⁄100 = .15 = 0.15

7⁄4 = (7x25)⁄(4x25) = 175⁄100 = 1.75

13⁄50 = (13x2)⁄(50x2) = 26⁄100 = 0.26

5⁄8 = (5x125)⁄(8x125) = 625⁄1000 = 0.625

1⁄250 = (1x4)⁄(250x4) = 4⁄1000 = 0.004

Long Division Method : Fractions to Decimals

This is a general method and can be used for any fraction.

Step 1 : Perform the usual long division with numerator as dividend and denominator as divisor till we get a remainder (which is less than the divisor).

Step 2 : Put a decimal point in the dividend and the quotient.

Step 3 : Put a zero on the right of the decimal point in the dividend as well as on the right of the remainder. Divide again just as whole numbers.

Step 4 : Repeat step 3 till the remainder is zero. The quotient is the required decimal.

The method will be clear by the following examples.

Example 1 is an Improper Fraction, Example 2 is a mixed fraction and Example 3 is a proper fraction.

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Convert the following fractions into decimals by simple method

13⁄10

693⁄100

29⁄10000

9856⁄1000

9731⁄100000

9⁄5

7⁄20

8⁄125

11⁄40

1⁄16

Convert the following fractions into decimals by division method

35⁄8

37⁄40

16 ^{3}⁄_{8}

1 ^{9}⁄_{16}

6 ^{9}⁄_{32}

For Answers, see at the bottom of the pages.

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