# The projected world population for the year 2025 is 8,000,000,000 people. How do you write this number in scientific form?

Jul 3, 2016

$8 \times {10}^{9}$

#### Explanation:

Scientific notation shows the size of a number as a power of 10.

$100 = 1 \times {10}^{2} , 10 000 = 1 \times {10}^{4}$ and so on.

However, the number at the front must be less than 10 - only one (non-zero) digit is allowed before the decimal point.

$8 , 000 , 000 , 000 = 8 \times 1 , 000 , 000 , 000 \text{ (8 billion)}$

=$8 \times {10}^{9} \text{ there are 9 place holders after the 8}$