To find the increase in the world's population from 1500 CE to 2020, we can subtract the population in 1500 from the population in 2020.
The population in 1500 CE was approximately \(4.5 \times 10^8\) (which is 450,000,000) and the population in 2020 was approximately \(7.8 \times 10^9\) (which is 7,800,000,000).
Now, let's perform the calculation:
\[ \text{Increase in population} = \text{Population in 2020} - \text{Population in 1500} \] \[ = 7.8 \times 10^9 - 4.5 \times 10^8 \]
To subtract these, we convert \(4.5 \times 10^8\) to the same scale as \(7.8 \times 10^9\):
\[ 4.5 \times 10^8 = 0.45 \times 10^9 \]
Now we can perform the subtraction:
\[ 7.8 \times 10^9 - 0.45 \times 10^9 = (7.8 - 0.45) \times 10^9 = 7.35 \times 10^9 \]
Thus, the increase in the world’s population from 1500 CE to 2020 is approximately \(7.35 \times 10^9\), or 7.35 billion people.