Calculate and write the answer in scientific notation: (i) If each person in the world had 30 pieces of clothing, Class 8

Calculate and write the answer in scientific notation: (i) If each person in the world had 30 pieces of clothing, Class 8

Question 1.

Calculate and write the answer in scientific notation:

(i) If each person in the world had 30 pieces of clothing, find the total number of pieces of clothing.

(ii) There are about 100 million bee colonies in the world. Find the number of honeybees if each colony has about 50,000 bees.

(iii) The human body has about 38 trillion bacterial cells. Find the bacterial population residing in all humans in the world.

(iv) Total time spent eating in a lifetime in seconds.

Solution:

(i) 30 × 8 × ⁹ = 240 × 10⁹ = 2.4 × 10¹¹

(ii) 100 × 50000 million honeybees= 5 × 10⁶ million

(iii) 38 × 8 × 10⁹ trillion= 304 × 10⁹ trillion = 3.04 × 10¹¹ trillion bacterial cells

(iv) 30 × 60 × 10⁹ seconds= 1800 × 10⁹ seconds = 1.8 × 10¹²

seconds, assuming that a person takes half an hour per day for taking meals.

Question 12.

What was the date 1 arab/1 billion seconds ago?

Solution:

Number of days 1 arab/1 billion ago

= [latex]\frac{10^9}{60 \times 60 \times 24}=\frac{10^7}{36 \times 24}[/latex]

= 1.157 × 10⁴ days

= 11570 days

= [latex]\frac{11570}{365}[/latex] years = 31.7 years

The date will be in the month of approximate June of the year 2026 - 31 = 1995.

It may be May 1995 or June 1995 or July 1995.