Class - VIII - Maths
What is a Cube Root (Page 5/7)
(Contiued from page 4 )
Note : If the one side of a cube is doubled, the volume will increase by 8 (2*2*2) times.
If the one side of a cube is tripled, the volume will increase by 27 (3*3*3) times and so on.
The perfect Cube never ends with two zeros ('00')
Question - Type 6 - Find the cube root of -27
Answer - 6- Make the factors i.e.
-27= (-3)*(-3)*(-3)= therefore cube root is -3
The cube root of -ve number is always -ve.
Question - Type 7 - Find the volume of the cube whose surface area is 600 sqM.
Answer - 1- The surface area of a cube = 6*L*L (where L is length of one side)
Therefore 6*L*L=600
L*L=100 M therefore L=10 M
The cube volume = L*L*L = 10*10*10
Volume= 1000 cubic M
(Cont..... to page 6 )
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( What is a Cube Root)