MSN: Rifle Zero Distances Explained: Is 50, 100, or 200 Yards the Sweet Spot?
Rifle Zero Distances Explained: Is 50, 100, or 200 Yards the Sweet Spot?
In a scientific or mathematical context they might occur, in which case you should use standard index form 1×10¹⁰⁰ for one followed by 100 zeros. There is the joke word "googol" for this.
Numbers with more than 100 zeros - English Language Learners Stack Exchange