RBSE Solutions for Class 7 Maths Chapter 5 Powers and Exponents Ex 5.3 is part of RBSE Solutions for Class 7 Maths. Here we have given Rajasthan Board RBSE Class 7 Maths Chapter 5 Powers and Exponents Exercise 5.3.

Board |
RBSE |

Textbook |
SIERT, Rajasthan |

Class |
Class 7 |

Subject |
Maths |

Chapter |
Chapter 5 |

Chapter Name |
Powers and Exponents |

Exercise |
Ex 5.3 |

Number of Questions |
5 |

Category |
RBSE Solutions |

## Rajasthan Board RBSE Class 7 Maths Chapter 5 Powers and Exponents Ex 5.3

Question 1

Write the following numbers (RBSESolutions.com) into standard form :

(i) 50,0000

(ii) 48,30,000

(iii) 3,94,00,00,00,000

(iv) 30000000

(v) 180000

Solution:

(i) 50,0000 = 5.0 x 100000 = 5.0 x 10^{5}

(ii) 48,30,000 = 4.83 x 1000000 = 4.83 x 10^{6}

(iii) 3,94,00,00,00,000

= 3.94 x 100000000000

= 3.94 x 10^{11}

(iv) 30000000 = 3.0 x 10000000 = 3.0 x 10^{7}

(v) 180000 = 1.8 x 100000 = 1.8 x 10^{5}

Question 2

Distance of the sun from the (RBSESolutions.com) earth is approximately 15,00,00,00 km. Express this distance in scientific notations.

Solution:

Distance of earth from sun = 15,00,00,000 km

∴ Scientific expression = 1.5 x 100000000 km

= 1.5 x 10^{8} km

Question 3

A person gets 3000 calorie energy from his daily meal. Represent (RBSESolutions.com) in scientific notations, how much energy he will get in one year.

Solution:

Calories received daily = 3000 calories

∴ Calories received during 365 days = 3000 x 365 calories

=1095000 calories

∴ Scientific expression = 1.095 x 10^{6} calories.

Question 4

According to an estimation, Indian railways (RBSESolutions.com) transports approximately 1 crore 30 lakhs people from one place to another daily. How many people travel by train in 30 days ? Write your answer in standard form.

Solution:

∵ Number of passengers travel in 1 day = 1 crore 30 lac = 1,30,00,000

∴ Number of passengers travels in 30 days = 30 x 1,30,00,000

= 390000000 = 3.9 x 10^{8}

Question 5

Write the following in (RBSESolutions.com) simple form :

(i) 2.5 x (10)^{4}

(i) 1.75 x (10)^{6}

(iii) 1.21 x (10)^{-8}

(iv) 4.50 x (10)^{-5}

Solution:

(i) 2.5 x (10)^{4} = 2.5 x 10 x 10^{3}

= 25 x 1000 = 25000

(ii) 1.75 x (10)^{6} = 1.75 x 10 x 10 x 10^{4}

= 175 x 10^{4} = 175 x 10000

= 1750000

(iii) 1.21 x (10)^{-8} = 1.21 x 10^{-1} x 10^{-7}

= 0.121 x 10^{-7}

= 0.0000000121

(iv) 4.50 x (10)^{-5} = 4.50 x 10^{-1} x 10^{-4}

= 0.45 x 10^{-4} = 0.000045

We hope the RBSE Solutions for Class 7 Maths Chapter 5 Powers and Exponents Ex 5.3 will help you. If you have any query regarding Rajasthan Board RBSE Class 7 Maths Chapter 5 Powers and Exponents Exercise 5.3, drop a comment below and we will get back to you at the earliest.