NCERT Solutions for Class 8 Maths Chapter 12 Exponents and Powers Ex 12.2 are part of NCERT Solutions for Class 8 Maths. Here we have given NCERT Solutions for Class 8 Maths Chapter 12 Exponents and Powers Ex 12.2.

Board |
CBSE |

Textbook |
NCERT |

Class |
Class 8 |

Subject |
Maths |

Chapter |
Chapter 12 |

Chapter Name |
Exponents and Powers |

Exercise |
Ex 12.2 |

Number of Questions Solved |
4 |

Category |
NCERT Solutions |

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

**Question 1.**

**Express the following numbers in standard form:**

**(i)** 0.0000000000085

**(ii)** 0.00000000000942

**(iii)** 6020 000 000 000 000

**(iv)** 0.00000000837

**(v)** 31860000000

**Solution.**

**Question 2.**

**Express the following numbers in usual form:**

**Solution.**

**Question 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 of a thick paper is 0.07 mm.

**Solution.**

**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.**

Total thickness of books

= 5 x 20 mm = 100 mm

Total thickness of paper sheets

= 5 x 0.016 mm = 0.080 mm

∴ Total thickness of the stack

= Total thickness of books + Total thickness of paper sheets

= 100 mm + 0.080 mm

= (100 + 0.080) mm

= 100.080 mm

= 1.0008 x mm.

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