Out of space ps4?

I have 7 games and no more space. But how confuses me. When I go to system storage everything is shown to me. When it comes to applications and saved data, I put all the games together and get a completely different number. Why is that?

here stands applications consumed 373.9

Then I did the math and another number came out, a smaller one. Why is that? The same applies to stored data.

Depending on how big the games are, there may be times when you save games.

Yes and 1024MB are 1GB that will be true what you get there.

Something goes for the system software

Started downloads also block the full storage space, but are not listed here. It occurs to me.

Do you know what "other" is when you go to applications?