RS Aggarwal Class 7 Solutions Chapter 5 Exponents Ex 5B

These Solutions are part of RS Aggarwal Solutions Class 7. Here we have given RS Aggarwal Solutions Class 7 Chapter 5 Exponents Ex 5B.

Other Exercises

Question 1.
Solution:
We can write in standard form
(i) 538 = 5.38 x 102
(ii) 6428000 = 6.428000 x 106 = 6.428 x 106
(iii) 82934000000 = 8.2934000000 x 1010 = 8.2934 x 1010
(iv) 940000000000 = 9.40000000000 x 1011 = 9.4 x 1011
(v) 23000000 = 2.3000000 x 107 = 2.3 x 107

Question 2.
Solution:
(i) Diameter of Earth = 12756000 m = 1.2756000 x 107m = 1.2756 x 107 m
(ii) Distance between Earth and Moon = 384000000 m = 3.84000000 x 108 = 3.84 x 108
(iii) Population of India in March 2001 = 1027000000 = 1.027000000 x 109 = 1.027 x 109
(iv) Number of stars in a galaxy = 100000000000 = 1.00000000000 x 1011 = 1 x 1011
(v) The present age of universe = 12000000000 years = 1.2000000000 x 1010 years = 1.2 x 1010 years

Question 3.
Solution:
The expanded form will be
(i) 684502 = 6 x 105 + 8 x 104 + 4 x 103 + 5 x 102 + 2
(ii) 4007185 = 4 x 106 + 0 x 105 + 0 x 104 + 7 x 103 + 1 x 102 + 8 x 101 + 5 x 100
(iii) 5807294 = 5 x 106 + 8 x 105 + 0 x 104 + 7 x 103 + 2 x 102 + 9 x 101 + 4 x 100
(iv) 50074 = 5 x 104 + 0 x 103 + 0 x 102 + 7 x 101 + 4 x 100

Question 4.
Solution:
(i) 6 x 104 + 3 x 103 + 0 x 102 + 7 x 101 + 8 x 100
= 60000 + 3000 + 0 + 70 + 8
= 63078
(ii) 9 x 106 + 7 x 105 + 0 x 104 + 3 x 103 + 4 x 102 + 6 x 101 + 2 x 100
= 9000000 + 700000 + 0 + 3000 + 400 + 60 + 2
= 9703462
(iii) 8 x 105 + 6 x 104 + 4 x 103 + 2 x 102 + 9 x 101 + 6 x 100
= 800000 + 60000 + 4000 + 200 + 90 + 6
= 864296

Hope given RS Aggarwal Solutions Class 7 Chapter 5 Exponents Ex 5B are helpful to complete your math homework.

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