What is a Cube Root
Maths Questions Answers
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Written by: Sanjay Srivastava
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Class - VIII - Maths:- INDEX
1. Squares & Square Roots2. Cubes & Cube Roots
3. Exponents & Radicals
4. Profit Loss & Discount
5. Compound Interest
6. Algebraic Identities
7. Polynomials
8. Linear Equations
9. Parallel Lines
10. Types of Quadrilaterals
11. Construction of Quadrilaterals
12. Circles
13. Areas
14. Surface Areas
15. Volumes
16. Statistics
Class - VIII - Maths
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 (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 )
© funandhobby.com ( What is a Cube Root)