The Japanese population is 125.13 million. It decreased by 270,000 in one year.
(Nov, 2016 Ministry of Internal Affairs and Communications, Statistics Bureau, Population Estimate)
Set the population as "P", the reducing number as "D" and let the unit for both be ten thousand.
When keep decreasing in the same way every year since 2016, the population at 2100?
Let's make it into a graph ('/' is the symbol of division).
What if the reducing number is increased by 20,000 every year?
Try it!
1. Stop with the ESC key and check the population of 2060
2. Let's set the reducing number to 30,000 per every year
3. Let's change the character "*" in the graph to another character
4. Let's change a number at line 42, 1000 to 100
5. Let's increase the population
6. The world population is 7.3 billion people. How if will increase by 100 million every year?