Question

At the end of the 20th century, the world population was approximately 6.1 × 10⁹ people. Express this population in usual form. How would you say this number in words?

Answer 1

The world population at the end of 20^th century = 6.1 × 10⁹ people

Usual form of 6.1 × 10⁹ = 6.1 × 1, 000, 000, 000

= 6, 100, 000, 000

6, 100, 000, 000 can be read as six billion one hundred million.