NCERT Grade 8-Exponents and Powers-Answers – MySchoolPage

NCERT Grade 8-Exponents and Powers-Answers

NCERT Solutions for Class 8 Maths

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5.    5m ÷ 5-3 = 55.                     ⇒            5m-(-) = 55                  [∵  am ÷ an = 5m-n]

Comparing exponents both sides, we get

⇒ m + 3 = 5

⇒ m = 5 – 3

⇒ m = 2

6.    

7.    

8.    (i) 0.0000000000085 = 0.0000000000085   = 8.5 × 10-12

(ii) 0.00000000000942 = 0.00000000000942  = 9.42 × 10-12

(iii) 6020000000000000 = 6020000000000000  6.02 × 1015

(iv) 0.00000000837 = 0.00000000837  8.37 × 10-9

(v) 31860000000 = 31860000000  = 3.186 × 10

9.    (i)

(ii) 4.5 × 104 = 4.5 × 10000 = 45000

(iii) 

(iv) 1.0001 × 109 = 1000100000

(v) 5.8 × 1012 = 5.8 × 1000000000000 = 5800000000000

(vi) 3.61492 × 106 = 3.61492 × 1000000 = 3614920

10.  (i) 1 micron = 2 × 10-6

(ii) Charge of an electron is 0.00000000000000000016 coulombs.

= 0.00000000000000000016  = 1.6×10-19 coulomb

(iii) Size of bacteria = 0.0000005 = 

(iv) Size of a plant cell is 0.00001275 m

(v) Thickness of a thick paper = 0.07 mm 

11.  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  =1.0008 × 102 mm

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