# 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:      (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:  (7) Write each of the following numbers in usual form: Updated: November 23, 2018 — 2:23 pm

1. 1. 