Hold on to it
It's what I believe to be a 100,000,000 mark bank note from 1929, which was a year that the economy, due to the great war (ww1), was in the gutter. That bank note would have gotten you maybe half a loaf of bread at the time, but the history of the note is priceless. Please do not discard a piece of German history; my family lived through that time period in Germany and these, while not worth much cash, are a memento of the hard times the people went through before the National Socialist Workers Party was formed.