Secondary School (English Medium) (5 to 8) कक्षा ८ - CBSE Question Bank Solutions for Mathematics

Verify commutativty of addition of rational numbers for each of the following pairs of rotional numbers: 

Using commutativity and associativity of addition of rational numbers, express each of the following as a rational number:

Using commutativity and associativity of addition of rational numbers, express each of the following as a rational number:

Using commutativity and associativity of addition of rational numbers, express each of the following as a rational number:

Using commutativity and associativity of addition of rational numbers, express each of the following as a rational number:

Find the  cubes of the number  7 .

Find the  cubes of the number 12 .

Find the  cubes of the number 16 .

Find the  cubes of the number 21 .

Find the  cubes of the number 40 . 

Find the  cubes of the number 55 .

Find the  cubes of the number 100 . 

Find the  cubes of the number 302 .

Find the  cubes of the number 301 .

Write the cubes of all natural numbers between 1 and 10 and verify the following statements:
(i) Cubes of all odd natural numbers are odd.
(ii) Cubes of all even natural numbers are even.

Write the cubes of 5 natural numbers which are multiples of 3 and verify the followings:
'The cube of a natural number which is a multiple of 3 is a multiple of 27'

Write the cubes of 5 natural numbers which are of the form 3n + 1 (e.g. 4, 7, 10, ...) and verify the following:
'The cube of a natural number of the form 3n + 1 is a natural number of the same form i.e. when divided by 3 it leaves the remainder 1'.

Write the cubes of 5 natural numbers of the form 3n + 2 (i.e. 5, 8, 11, ...) and verify the following:
'The cube of a natural number of the form 3n + 2 is a natural number of the same form i.e. when it is dividend by 3 the remainder is 2'.

Which of the following is  perfect cube? 

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