Percentage - Exercise 12.1 | Mathematics (Maths) Class 8 PDF Download

 Page 1


Q u e s t i o n : 1
Write each of the following as percent:
i
7
25
i i
14
625
i i i
5
8
i v
0.8
v
0.005
v i
3 : 25
v i i
11 : 80
v i i i
111 : 125
i x
13 : 75
x
15 : 16
x i
0.18
x i i
7
125
S o l u t i o n :
i 
7
25
=
7
25
×100 =
700
25
= 28 % ii 
14
625
=
14
25×25
×100 =
1400
625
= 2. 24 % iii 
5
8
= 0. 625 ×100 = 62. 5 % iv 0. 8 =
8
10
×100 = 80 % v 0. 005 = 0. 005 ×100 = 0. 5 % vi 3: 25 =
3
25
×100 =
300
25
= 12
Q u e s t i o n : 2
Convert the following percentages to fractions and ratios:
i
25%
i i
2.5%
i i i
0.25%
i v
0.3%
v
125%
S o l u t i o n :
i 25 % =
25
100
=
5
20
=
1
4
? Ratio = 1: 4 ii 2. 5 % =
2.5
100
=
25
1000
=
5
200
=
1
40
? Ratio = 1: 40 iii 0. 25 % =
0.25
100
=
25
10000
=
5
2000
=
1
400
? Ratio = 1: 400 iv 0. 3 % =
0.3
100
=
3
1000
? Ratio = 3: 1000 v 125
Q u e s t i o n : 3
Express the following as decimal fractions:
i
27%
i i
6.3%
i i i
32%
i v
0.25%
v
7.5%
v i
1
8
%
S o l u t i o n :
i 27 % =
27
100
= 0. 27 ii 6. 3 % =
6.3
100
= 0. 063 iii 32 % =
32
100
= 0. 32 iv 0. 25 % =
0.25
100
= 0. 0025 v 7. 5 % =
7.5
100
= 0. 075 vi 
1
8
% =
1
8
×
1
100
=
1
800
= 0. 00125
  
   
   
   
   
   
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