Learn English – How to say that something was decreased and became X times less

phrase-request

How do I say that something was decreased and became X times less? In a sentence like: The new file is 20K while the old file was 100K, that's a decrease in 5 times? Or: The file was 100K and it decreased by 5 times, becoming only 20K?

For instance, I found this topic where someone said:

"Decreased by 8 times" doesn't mean anything to me at all.

What are the most used and naturally sounding constructions for this types of sentences?

Best Answer

The other answers are correct, but the common English expression that is the actual equivalent of what you are referring to is

The file size decreased by a factor of five.