RS Aggarwal Class 8 Math Second Chapter Exponents Exercise 2B Solution
EXERCISE 2B
(1) Write each of the following numbers in standard form:
(i) 57.36 = 5.736 × 10
(ii) 3500000 = 3.5 × 106
(iii) 273000 = 2.73 × 105
(iv) 168000000 = 1.68 × 108
(v) 4630000000000 = 4.63 × 1012
(vi) 345 × 105 = 3.45 × 107
(2) Write each of the following numbers in usual from:
![](https://www.netexplanations.com/wp-content/uploads/2018/11/Class-8-Rs-Aggarwal-Math-Solution-Ex-2B.png)
![](https://www.netexplanations.com/wp-content/uploads/2018/11/Class-8-Rs-Aggarwal-Math-Solution-Ex-2B-1.png)
![](https://www.netexplanations.com/wp-content/uploads/2018/11/Class-8-Rs-Aggarwal-Math-Solution-Ex-2B-2.png)
![](https://www.netexplanations.com/wp-content/uploads/2018/11/Class-8-Rs-Aggarwal-Math-Solution-Ex-2B-3.png)
![](https://www.netexplanations.com/wp-content/uploads/2018/11/Class-8-Rs-Aggarwal-Math-Solution-Ex-2B-4.png)
![](https://www.netexplanations.com/wp-content/uploads/2018/11/Class-8-Rs-Aggarwal-Math-Solution-Ex-2B-5.png)
(3) (i) The height of Mount Everest is 8848 m. write it in standard form.
Solution: the height of Mount Everest = 8848 m
= (8.848 × 1000) m = (8.848 × 103) m.
(ii) The speed of light is 300000000 m/sec. Express it in standard form.
Solution: The speed of light = 300000000 m/sec
= (3 × 100000000) m/sec = (3 × 108) m/sec
(iii) The distance from the earth to the sun is 149600000000 m. Write it in standard form.
Solution: The distance between earth and sun = 149600000000 m
= (1.496 × 100000000000) m = (1.496 × 1011) m
(4) Mass of earth is (5.97 × 1024) kg and mass of moon is (7.35 × 1022) kg. What is the total mass of the two?
Solution: The total mass = {(5.97 × 102 × 1022) + (7.35 × 1022)} kg
= {(597 + 7.35) × 1022}kg = 604.35 × 1022 kg
(5) Write each of the following numbers in standard form:
![](https://www.netexplanations.com/wp-content/uploads/2018/11/Class-8-Rs-Aggarwal-Math-Solution-Ex-2B-6.png)
![](https://www.netexplanations.com/wp-content/uploads/2018/11/Class-8-Rs-Aggarwal-Math-Solution-Ex-2B-7.png)
(7) Write each of the following numbers in usual form:
![](https://www.netexplanations.com/wp-content/uploads/2018/11/Class-8-Rs-Aggarwal-Math-Solution-Ex-2B-8.png)
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