NCERT Solutions for Class 8 Maths Chapter 12 Exponents and Powers Ex 12.2

# NCERT Solutions for Class 8 Maths Chapter 12 Exponents and Powers Ex 12.2

## NCERT Solutions for Class 8 Maths Chapter 12 Exponents and Powers Ex 12.2

NCERT Solutions for Class 8 Maths Chapter 12 Exponents and Powers Ex 12.2 are the part of NCERT Solutions for Class 8 Maths. Here you can find the NCERT Solutions for Class 8 Maths Chapter 12 Exponents and Powers Ex 12.2.

### Ex 12.2 Class 8 Maths Question 1.

Express the following numbers in standard form.
(i) 0.0000000000085
(ii) 0.00000000000942
(iii) 6020000000000000
(iv) 0.00000000837
(v) 31860000000

Solution:

### Ex 12.2 Class 8 Maths Question 2.

Express the following numbers in usual form.
(i) 3.02 × 10-6
(ii) 4.5 × 104
(iii) 3 × 10-8
(iv) 1.0001 × 109
(v) 5.8 × 1012
(vi) 3.61492 × 106

Solution:

### Ex 12.2 Class 8 Maths Question 3.

Express the number appearing in the following statements in standard form.
(i) 1 micron is equal to 1/1000000 m.
(ii) Charge of an electron is 0.00000000000000000016 coulomb.
(iii) Size of a bacteria is 0.0000005 m.
(iv) Size of a plant cell is 0.00001275 m.
(v) Thickness of a thick paper is 0.07 mm.

Solution:

### Ex 12.2 Class 8 Maths Question 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?

Solution:
Given: Thickness of each book = 20 mm
Thickness of 5 books = 5 × 20 mm = 100 mm
Thickness of 1 sheet of paper = 0.016 mm
Thickness of 5 sheets of paper = 5 × 0.016 mm = 0.08 mm
Total thickness = 100 mm + 0.08 mm
= 100.08 mm = 1.0008 × 102 mm

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