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# NCERT Solutions for Class 8 Maths Exercise 12.2 ### myCBSEguide App

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NCERT solutions for Class 8 Maths Exponents and Powers ## NCERT Solutions for Class 8 Maths Exponents and Powers

###### 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  = 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

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

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

NCERT Solutions Class 8 Mathematics PDF (Download) Free from myCBSEguide app and myCBSEguide website. Ncert solution class 8 Mathematics includes text book solutions from Class 8 Maths Book . NCERT Solutions for CBSE Class 8 Maths have total 16 chapters. 8 Maths NCERT Solutions in PDF for free Download on our website. Ncert class 8 solutions PDF and Maths ncert class 8 PDF solutions with latest modifications and as per the latest CBSE syllabus are only available in myCBSEguide.

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