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Converting Fractions to Decimals

In converting fractions to decimals, we know that decimals are fractions with denominators 10, 100, 1000 etc. In order to convert other fractions into decimals, we follow the following steps:

Step I: Convert the fraction into an equivalent fraction with denominator 10 or 100 or 1000 if it is not so.

Step II: Take the given fraction’s numerator. Then mark the decimal point after one place or two places or three places from right towards left if the given fraction’s denominator is 10 or 100 or 1000 respectively.

Note that; insert zeroes at the left of the numerator if the numerator has fewer digits.

● To convert a fraction having 10 in the denominator, we put the decimal point one place left of the first digit in the numerator.

For example:

(i) 610 = .6 or 0.6

(ii) 1610 = 1.6

(iii) 11610 = 11.6

(iv) 111610 = 111.6


● To convert a fraction having 100 in the denominator, we put the decimal point two places left of the first digit in the numerator.

For example:

(i) 7100 = 0.07

(ii) 77100 = 0.77

(iii) 777100 = 7.77

(iv) 7777100 = 77.77


● To convert a fraction having 1000 in the denominator, we put the decimal point three places left of the first digit in the numerator.

For example:

(i) 91000 = 0.009

(ii) 991000 = 0.099

(iii) 9991000 = 0.999

(iv) 99991000 = 9.999


The problem will help us to understand how to convert fraction into decimal.

In 351100 we will change the fraction to decimal.

First write the numerator and then divide the numerator by denominator and complete the division.

Put the decimal point such that the number of digits in the decimal part is the same as the number of zeros in the denominator.

Converting Fractions to Decimals

Let us check the division of decimal by showing a complete step by step decimal divide.

Fractions to Decimals












We know that when the number obtained by dividing by the denominator is the decimal form of the fraction.

There can be two situations in converting fractions to decimals:

When division stops after a certain number of steps as the remainder becomes zero.

When division continues as there is a remainder after every step.

Here, we will discuss when the division is complete.


Explanation on the method using a step-by-step example:

Divide the numerator by denominator and complete the division.

If a non-zero remainder is left, then put the decimal point in the dividend and the quotient.

Now, put zero to the right of dividend and to the right of remainder.

Divide as in case of whole number by repeating the above process until the remainder becomes zero.


1. Convert 233100 into decimal.

Solution:

How to Convert Fraction into Decimal
















2. Express each of the following as decimals.

(i) 152

Solution:

152

= 15×52×5

= 7510

= 7.5

(Making the denominator 10 or higher power of 10)


(ii) 1925

Solution:

1925

= 19×425×4

= 76100

= 0.76


(iii) 750

Solution:

750 = 7×250×2 = 14100 = 0.14


Note:

Conversion of fractions into decimals when denominator cannot be converted to 10 or higher power of 10 will be done in division of decimals.

Converting Fractions to Decimals


Working Rules for Conversion of a Fractions into a Decimals:

To convert a common fraction into decimal number, we have to follow the following steps.

Step I: Change the given common fraction into an equivalent fraction whose denominator is 10 or 100 or 1000, etc.

Step II: Count the number of zeros in the denominator after 1.

Step III: In the numerator, start from the extreme right and move the decimal point to


Examples on Converting Fractions to Decimals:

1. Convert the following fractions into decimals.

(i) 34

(ii) 512

(iii) 31125


Solution:

(i) 34 = 3×254×25 = 75100 = 0.75

(ii) 512 = 112 = 11×52×5 = 5510 = 5.5

(iii) 31125 = 31×8125×8 = 2481000 = 0.248


2. Convert 2716 into a decimal.

Solution:

2716 = 2×16+716 = 32+716 = 3916

Now, 3916 = 39×62516×625 = 2437510000 = 2.4375

Thus, 3916 = 2.4375


3. Express the following fractions as decimals:

(i) 310

Solution:

Using the above method, we have

310

= 0.3


(ii) 14791000

Solution:

14791000

= 1.479


(iii) 712

Solution:

712

= 7 + 12

= 7 + 5×15×2

= 7 + 510

= 7 + 0.5

= 7.5


(iv) 914

Solution:

914

= 9 + 14

= 9 + 25×125×4

= 9 + 25100

= 9 + 0.25

= 9.25


(v) 1218

Solution:

1218

= 12 + 18

= 12 + 125×1125×8

= 12 + 1251000

= 12 + 0.125

= 12.125


Converting a Common Fraction into a Decimal Fraction:

For converting a common fraction into a decimal fraction, we follow the division method. In this method, we take these steps.


Working Rules for Converting a Common Fraction into a Decimal Fraction:

Step I: Divide the numerators by the denominator till a non-zero remainder is obtained.

Step II: Put a decimal point in the dividend as well as in the quotient.

Step III: Put a zero on the right of the decimal point in the dividend as well as on the right of the remainder whenever required.

Step IV: Divide again just as we do in whole numbers.

Step V: Repeat step IV till the remainder is zero.


Examples on Converting a Common Fraction into a Decimal Fraction:

1. Convert into decimal.

(i) 34

(ii) 414

Solution:

(i) Divide the numerator 3 by the denominator 4.

Convert into Decimal

Therefore, 34 = 0.75


(ii) 414

First convert into improper fraction

4144×4+14174

Now, divide the numerator 17 by the denominator 4.

Convert Fraction into Decimal

Therefore, 414 = 4.25


More Examples on Converting Fractions into Decimals:

Let us consider some examples

2. Convert the following into decimals

(i) 1/2

(ii) 5/8

(iii) 2/5

Solution:

As we know that decimal numbers are fractions with denominators as 10,100,1000, ... So, to convert a fraction into a decimal, multiply both the denominator and the numerator of the fraction with a number which can give you denominator as 10, 100, 1000 ....

(i) 12 = 1×52×5(As 10 is the multiple of 2.)

                             = 510

                             = 0.5


(ii) 58 = 5×1258×125; (As 1000 is the multiple of 8.)

                             = 6251000

                             = 0.625


(iii) 25 = 2×25×2; (As 10 is the multiple of 5.)

                             = 410

                             = 0.4


3. Convert the following into decimals

(i) 334

(ii) 425


Solution:

(i) 334 = 3×4+34

                              = 154

                              = 15×254×25

                              = 375100

                              = 3.75


(ii) 425 = 4×5+25

                              = 225

                              = 22×25×2

                              = 4410

                              = 4.4


Worksheet on Converting Fractions to Decimals:

1. Convert the following fractional numbers to decimal numbers:

(i) 710

(ii) 23100

(iii) 172100

(iv) 4905100

(v) 91000

(vi) 841000

(i) 6721000

(i) 47471000


Answers:

(i) 0.7

(ii) 0.23

(iii) 1.72

(iv) 49.05

(v) 0.009

(vi) 0.084

(i) 0.672

(i) 4.747


2. Express the following fractions as decimal numbers:

(i) 25 

(ii) 925

(iii) 820

(iv) 22100

(v) 234

(vi) 9725

(vii) 205125

(viii) 161640

(ix) 59261000


Answer:

2. (i) 0.4 

(ii) 0.36

(iii) 0.4

(iv) 0.22

(v) 2.75

(vi) 9.36

(vii) 1.64

(viii) 16.4

(ix) 5.926


3. Convert into decimals.

(i) 45

(ii) 310

(iii) 1950

(iv) 434

(v) 725

(vi) 2650

(vii) 714

(viii) 6720

(ix) 34

(x) 2740

(xi) 912

(xii) 2021200

(xiii) 11720

(xiv) 4925

(xv) 314

(xvi) 1735

(xvii) 21325

(xviii) 31725

(xix) 325

(xx) 11720

(xxi) 3150

(xxii) 176100

(xxiii) 758

(xxiv) 1234

(xxv) 16320

(xxvi) 2325

(xxvii) 3720

(xxviii) 858

(xxix) 345

(xxx) 2514


Answer:

3. (i) 0.8

(ii) 0.3

(iii) 0.38

(iv) 4.75

(v) o.28

(vi) 0.52

(vii) 7.25

(viii) 6.35

(ix) 0.75

(x) 0.675

(xi) 9.5

(xii) 20.105

(xiii) 1.85

(xiv) 4.36

(xv) 3.25

(xvi) 17.6

(xvii) 2.25

(xviii) 3.68

(xix) 3.4

(xx) 1.85

(xxi) 3.02

(xxii) 1.76

(xxiii) 7.625

(xxiv) 12.75

(xxv) 16.15

(xxvi) 2.12

(xxvii) 3.35

(xxviii) 8.625

(xxix) 3.8

(xxx) 25.25


4. Convert into decimals.

(i) 38

(ii) 258

(iii) 314

(iv) 712

(v) 178

(vi) 435

(vii) 615

(viii) 936


Answer:

4. Convert into decimals.

(i) 0.375

(ii) 2.625

(iii) 3.25

(iv) 7.5

(v) 1.875

(vi) 4.6

(vii) 6.2

(viii) 9.5


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Decimals

Decimal Numbers

Decimal Fractions

Like and Unlike Decimals

Comparing Decimals

Decimal Places

Conversion of Unlike Decimals to Like Decimals

Decimal and Fractional Expansion

Terminating Decimal

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Converting Decimals to Fractions

Converting Fractions to Decimals

H.C.F. and L.C.M. of Decimals

Repeating or Recurring Decimal

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BODMAS/PEMDAS Rules - Involving Decimals

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Multiplying Decimal by a Decimal Number

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7th Grade Math Problems

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