Percentage (Exercise 11.3) RD Sharma Solutions | Mathematics (Maths) Class 7 PDF Download

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1. Express each of the following percents as decimals: 
(i) 12.5% 
(ii) 75% 
(iii) 128.8% 
(iv) 0.05% 
 
Solution: 
(i) Given 12.5% 
= (12.5/100) 
= 0.125 
 
(ii) Given 75% 
= (75/100) 
= 0.75 
 
(iii) Given 128.8% 
= (128.8/100) 
= 1.288 
 
(iv) Given 0.05% 
= (0.05/100) 
= 0.0005 
 
2. Express each of the following decimals as per cents: 
(i) 0.004 
(ii) 0.24 
(iii) 0.02 
(iv) 0.275 
 
Solution: 
(i) Given 0.004 
0.004 can be written as 4/1000 
= (4/1000) × 100 
= 0.4% 
Page 2


 
 
 
 
 
 
 
 
         
 
1. Express each of the following percents as decimals: 
(i) 12.5% 
(ii) 75% 
(iii) 128.8% 
(iv) 0.05% 
 
Solution: 
(i) Given 12.5% 
= (12.5/100) 
= 0.125 
 
(ii) Given 75% 
= (75/100) 
= 0.75 
 
(iii) Given 128.8% 
= (128.8/100) 
= 1.288 
 
(iv) Given 0.05% 
= (0.05/100) 
= 0.0005 
 
2. Express each of the following decimals as per cents: 
(i) 0.004 
(ii) 0.24 
(iii) 0.02 
(iv) 0.275 
 
Solution: 
(i) Given 0.004 
0.004 can be written as 4/1000 
= (4/1000) × 100 
= 0.4% 
 
 
 
 
 
 
 
 
(ii) Given 0.24 
0.24 can be written as (24/100) 
= (24/100) × 100 
= 24% 
 
(iii) Given 0.02 
0.02 can be written as (2/100) 
= (2/100) × 100  
= 2% 
 
(iv) Given 0.275 
0.275 can be written as (275/1000) 
= (275/1000) × 100 
= 27.5% 
 
3. Write each of the following as whole numbers or mixed numbers: 
(i) 136% 
(ii) 250% 
(iii) 300% 
 
Solution: 
(i) Given 136% 
= (136/100) 
On simplifying we get 
= (34/25) 
 
(ii) Given 250%  
= (250/100) 
On simplifying  
= (5/2) 
 
(iii) Given 300% 
= (300/100) 
= 3