How to write 3 9/100 into a decimal?

How do you write 39/100 into a decimal form is by simply dividing 39 to 100.
Hence,
1. 39 / 100 = 0.39

0.39 is the decimal form of the given value.
Other examples can include:
1.  100 / 1000 = 0.1
2.  45 / 10 = 4.5