INTRODUCTION 
    In this chapter, we will study :

  •          What are fractions 
  •          Types of fractions- 

         (a)     Comparison of fractions             
         (b)     Operation on fractions

FRACTIONS    
    Fraction is a part of whole.

Denominator tells us about into how many equal parts the whole is divided. 
Numerator tells us how many parts are considered of the whole

Types of Fractions
1.    Decimal fractions : Any fraction whose denominator is in the form of 10n, n   N as i.e.10,100, 1000 etc. is called a decimal fraction. 

2.    Vulgar fraction : Any fraction other than decimal fraction is called vulgar fraction. 

3.    Proper fraction : Any fraction having its numerator less than its denominator is called a proper fraction.

4.    Improper Fraction : Any fraction whose numerator is greater than or equal to the denominator is called an Improper fraction. 

5.    Mixed Fraction : When an improper fraction is expresed as sum of a natural number and a proper fraction is called mixed fraction. 

6.    Equivalent Fractions : The fractions obtained by multiplying the numerator and denominator both by the same number are called Equivalent fractions.

7.    Like Fractions : Those fractions which have same denominator but different numerator are called like fractions.

8.    Unlike Fractions : Fractions which do not have common denominator are unlike fractions.

 

Chapter 2

Fractions and Decimals

 

Proper and Improper fractions

Types of Fractions

 There are three major types of fractions
Proper Fraction

Improper Fraction
Mixed Fraction
Proper Fractions

Proper Fraction

 Fractions where numerator is always smaller than the denominator.

 It's called proper because the number of region will always be lower than the total number of region. Fore.g.1/3,1/6,2/7,9/10 and so on.

The value of a proper fraction will always be lower than 1.  

 Improper Fractions

 Fractions where numerator is always further than the denominator.

It's called improper because the number of region will be more than the total number of region. Fore.g.5/3,9/6,8/7,
 The value of a proper fraction will always be more than 1.

Mixed Fraction

Fractions where there's a combination of a whole and a fractional part. e.g.


 All Improper fractions can be expressed as mixed fractions

 Like and Unlike Fractions
 Like fractions are fractions with same denominator. For eg ½,15/2,19/2 and so on.
Unlike fractions are fractions with different denominators. Fore.g.16/5,7/8, ½,2/5,2/10.
It's important to note that like and unlike fractions are decided only on the base of denominator. The value of numerator doesn't count.

 Equivalent Fractions

Equivalent fractions are fractions which represent the same number.

e.g. Dipu divides the pizza into 2 equal halves and eats one half of it. Bholu divides the same pizza into 4 equal halves and eats two region of it.
 Pizza Share eaten by Bholu = 2 region out of 4 = 2/4. This can be further reduced to get  = ½ = 0.5
  Pizza Share eaten by dipu = 1 part of out of 2 = ½.
 ½ = 0.5.
therefore, although the fractions are2/4 and1/2 but they represent the same numbers. Hence they're equivalent fractions.
 In order to make equivalent number, we've to multiply both the numerator and the denominator by the same number. For eg we get the following fractions when we keep on dividing both the numerator and the denominator by the number 2.
 These fractions are equivalent since all of them can be reduced to the simplest fraction- ½.
 Equivalent fraction can also be formed by separating both the numerator and the denominator by the same number.
 It's important to note that the number by which we divide has to be similar that the number divides both the numerator and the denominator ideally.
 accordingly, we can first find the HCF of the numerator and the denominator further divide them by the HCF.
 These fractions are equivalent since all of them can be reduced to the simplest fraction- ½. Comparing Fractions

Comparing Like Fractions
 In like fractions, the denominators are the same. So, only numerators are compared.

The one with bigger numerator is the bigger fractions.
 e.g. ¾>1/4   

Comparing Unlike Fractions

 In unlike fractions, denominators are different.
 primarily, we try and make the denominators same.
 This is done by converting fractions into equivalent fractions. To do this, the LCM of different denominators.

Each fraction is converted into a form like that the LCM as the common denominator of both the fractions.
 Comparison of the matching fractions attained can be done by comparing the numerators.
 e.g.
LCM of 3 and 4 = 12
 Multiply Numerator and denominator of1/3 by 4 similar that the equivalent fraction has 12 in the denominator
 1 *4/3 * 4 = 4/12
 Multiply Numerator and denominator of2/4 by 3 similar that the equivalent fraction has 12 in the denominator
 2 *3/4 * 3 = 6/12
 Since the denominators are the same, equating the numerators we get
<6/12
 thus,1/3<2/4
 Problem Compare the fractions a) 3/ b and5/6 b)1/7 and1/4

 result
and5/6 are like fractions because they've common denominators.
 5 is greater than 3, so5/6 is more than3/6 and ¼ are unlike fractions.
 primarily, we try and form the denominators equal.
 This is done by converting fractions into equivalent fractions. To do this, the LCM of different denominators.

 The LCM of 7 and 4 is 28. We get
 1 *4/7 * 4 and 1 *7/4 * 7
4/28 and7/28
 These are like fractions now. Comparing the numerators, we get
<7/28.

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clas 7 math
Medha Sharma

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