**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**.**

**NCERT Solutions for Class 8 Maths Chapter 12 Exponents and Powers Ex 12.1****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 × 10

^{4}

**(iii)**3 × 10

^{-8}

**(iv)**1.0001 × 10

^{9}

**(v)**5.8 × 10

^{12}

**(vi)**3.61492 × 10

^{6}

**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 × 10^{2} mm

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