Here is a great resource for your classroom! These are clock circles that you hang up on the outer part of your clock (I have mine on the wall). These numbers are for the minute hand so they go by 5's. They are seperated in three sheets so you can print them on bright colorful card stock. This pdf of clock numbers has a traditional font. There is also a fun font in my tpt store.
This has really helped my students with telling time.