Question when searching for different files on…

Question when searching for different files on linux:

I am trying to search for certain files for a class im taking “operating systems” I can search for files with certain letters no problem I use this. ( ls -d [f]* )
But, what i’m trying to find is files with a number in it? I am looking into how to use GREP but I cannot see anywhere how to specify exactly what to look for.

this is the assignment I am working on ( i am very new to using linux commandline)

https://gyazo.com/9d69c7459d0d5c3ab69e11bd2c016514

submitted by /u/bobbybdennis
[link] [comments] via Linux 101 stuff. Questions are encouraged, noobs are welcome!