The world population in 1995 was approximately 5.7 billion people. How do you write this number in standard form?

May 29, 2017

$5.7 \times {10}^{9}$

Explanation:

$5.7$ $\text{billion}$ $= 5 , 700 , 000 , 000$

Numbers expressed in standard form are in the form $X \times {10}^{n}$.

$X$ must be a number between $1$ and $10$.

In this case, $X$ will be $5.7$.

$n$ is the number of decimal places shifted to reach $X$.

We need to move the decimal point $9$ places to the left to have it in between $5$ and $7$.

$R i g h t a r r o w 5 , 700 , 000 , 000 = 5.7 \times {10}^{9}$

$\therefore 5.7$ $\text{billion}$ $= 5.7 \times {10}^{9}$

Therefore, the world population in $1995$ was approximately $5.7 \times {10}^{9}$ people.