Click the green flag, and say the number you want to convert.
Probably way overcomplicated. I made this for a clicker I'm working on. You can use this if you give credit to me. You can't just backpack it, you also have to export/import the list contents (done by showing the list and right-clicking it). This works because I made a list with the number names (starting at thousand). I didn't check EVERY number in between Infinity and negative infinity, but it should work. If you do somehow get a number that doesn't display correctly, tell me in the comments, and I'll try to fix it. Notes: Scratch considers 1*10^309 to be infinity, there's nothing I can do about that. Above 1*10^102, it will just display ___e+___, because there aren't names for numbers that large (with two exceptions). I didn't include googol (because it's not in the same form as all of the -illions), or centillion (because the rest of the illions end at 10^102, so it would be a few more blocks just for 1 number. Everything is by me.