One year my school had a 3.5 inch floppy disk as part of the school supplies we were supposed to get. Mine was orange and you can tell a kid not to use it as a fidget toy, but they're absolutely gonna use it as a fidget toy. I don't think a single disk survived that year.
I also remember when my school got a fancy new "computer lab" that had all the colorful iMacs. There were still a few of the beige machines that read off of 7 inch floppies kicking around also.
Do you mean 5-1/4" ? While 7" did exist they were extremely rare outside of research academia/business and even then fairly rare. The main stream computers like the Apple IIe (in 82' ?) Came with 5-1/5" floppies. The IIe, being an extremely popular public school choice.