NCERT Solutions for Class 7 Maths Chapter 13 Exponents and Powers Ex 13.3 are part of NCERT Solutions for Class 7 Maths. Here we have given NCERT Solutions for Class 7 Maths Chapter 13 Exponents and Powers Ex 13.3.

- Exponents and Powers Class 7 Ex 13.1
- Exponents and Powers Class 7 Ex 13.2
- Exponents and Powers Class 7 MCQ

Board |
CBSE |

Textbook |
NCERT |

Class |
Class 7 |

Subject |
Maths |

Chapter |
Chapter 13 |

Chapter Name |
Exponents and Powers |

Exercise |
Ex 13.3 |

Number of Questions Solved |
4 |

Category |
NCERT Solutions |

## NCERT Solutions for Class 7 Maths Chapter 13 Exponents and Powers Ex 13.3

**Question 1.**

Write the following numbers in the expand forms :

**(i)** 279404

**(ii**) 3006194

**(iii)** 2806196

**(iv)** 120719

**(v)** 20068.

**Solution:**

**Question 2.**

Find the number from each of the following expanded forms :

**Solution:
**

**Question 3.**

Express the following numbers in standard form:

- 5,00,00,000
- 70,00,000
- 3,18,65,00,000
- 3,90,878
- 39087.8
- 3908.78

**Solution:**

- 5,00,00,000 = 5 × 10
^{7} - 70,00,000 = 7 × 10
^{6} - 3,18,65,00,000 = 3.1865 × 10
^{9} - 3,90,878 = 3.90878 × 10
^{5} - 39087.8 = 3.90878 × 10
^{4} - 3908.78 = 3.90878 × 10
^{3}

**Question 4.**

Express the number appearing in the following statements in standard form :

- The distance between Earth and Moon is 384,000,000 m.
- The speed of light in a vacuum is 300,000,000 miles.
- The diameter of the Earth is 1,27,56,000 m.
- Diameter of the Sun is 1,400,000,000 m.
- In a galaxy, there are on average 100,000,000,000 stars.
- The universe is estimated to be about 12,000,000,000 years old.
- The distance of the Sun from the centre of the Milky Way Galaxy is estimated to be 300,000,000,000,000,000,000 m.
- 60,230,000,000,000,000,000,000 molecules are contained in a drop of water weighing 1.8 gm.
- The earth has 1,353,000,000 cubic km of seawater.
- The population of India was about 1,027,000,000 in March 2001.

**Solution:**

- The mean distance between Earth and Moon is 3.84 × 10
^{8}m. - The speed of light in a vacuum is 3 × 10
^{8}m/s. - The diameter of the Earth is 1.2756 × 10
^{7}m. - The diameter of the Sun is 1.4 × 10
^{9}m. - In a galaxy, there are on average 1 × 10
^{11}stars. - The universe is estimated to be about 1.2 × 10
^{10}years old. - The distance of the Sun from the centre of the Milky Way Galaxy is estimated to be 3 × 10
^{20}m. - 6.023 × 10
^{22}molecules are contained in a drop of water weighing 1.8 gm. - The earth has 1.353 × 10
^{9}cubic km of seawater. - The population of India was about 1.027 × 10
^{9}in March 2001.

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