NCERT Solutions for Class 8 Maths Exercise 12.2

NCERT Solutions for Class 8 Maths Exercise 12.2 Class 8 Maths book solutions are available in PDF format for free download. These ncert book chapter wise questions and answers are very helpful for CBSE exam. CBSE recommends NCERT books and most of the questions in CBSE exam are asked from NCERT text books. Class 8 Maths chapter wise NCERT solution for Maths Book all the chapters can be downloaded from our website and myCBSEguide mobile app for free

NCERT solutions for Class 8 Maths Exponents and Powers Download as PDF

NCERT Solutions for Class 8 Maths Exponents and Powers

Class –VIII Mathematics(Ex. 12.2)

NCERT SOLUTION

1. Express the following numbers in standard form:

(i)   0.0000000000085   

(ii)  0.00000000000942

(iii) 6020000000000000  

(iv) 0.00000000837

(v)  31860000000

Ans. (i) 0.0000000000085

= 0.0000000000085  

=

(ii) 0.00000000000942

= 0.00000000000942  

=

(iii) 6020000000000000

= 6020000000000000  

=

(iv)  0.00000000837

= 0.00000000837  

=

(v) 31860000000 = 31860000000   =

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NCERT Solutions for Class 8 Maths Exercise 12.2

2. Express the following numbers in usual form:

(i)      

(ii)    

(iii)       

(iv)   

(v)    

(vi)

Ans. (i)  = 0.00000302

(ii) 4.5  10000 = 45000

(iii)  = 0.00000003

(iv)  = 1000100000

(v)  = 5.8 x 1000000000000

= 5800000000000

(vi)  = 3.61492  1000000

= 3614920

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NCERT Solutions for Class 8 Maths Exercise 12.2

3. Express the number appearing in the following statements in standard form:

(i)1 micron is equal to  m.

(ii) Charge of an electron is    0.000,000,000,000,000,000,16 coulomb.

(iii) Size of a bacteria is 0.0000005 m.

(iv) Size of a plant cell is

0.00001275 m.

(v) Thickness if a thick paper is 0.07 mm.

Ans. (i) 1 micron

=  m

(ii)Charge of an electron is

0.00000000000000000016 coulombs.

= 0.00000000000000000016  

=  coulomb

(iii) Size of bacteria = 0.0000005

=  =  m

(iv) Size of a plant cell is 0.00001275 m

= 0.00001275   =  m

(v) Thickness of a thick paper = 0.07 mm

= mm =  mm

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NCERT Solutions for Class 8 Maths Exercise 12.2

4. In a stack there are 5 books each of thickness 20 mm and 5 paper sheets each of thickness 0.016 mm. What is the total thickness of the stack?

Ans. Thickness of one book = 20 mm

Thickness of 5 books = 20  5 = 100 mm

Thickness of one paper = 0.016 mm

Thickness of 5 papers = 0.016  5

= 0.08 mm

Total thickness of a stack = 100 + 0.08

=100.08 mm

= 100.08

 mm

NCERT Solutions for Class 8 Maths Exercise 12.2

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