Can-Can is instantly recognizable by most people -- even by your students who don't listen
to classical music at home. This energetic piece by Offenbach is pretty easy to play,
too, in three different versions: with left hand whole-note chords, with left hand half-note
chords, and lastly, with fast-moving split chords. Here is a funny video of a piano duet version of this Offenbach music your students may enjoy -- a piano duet played, and conducted, all by the same person!
One of the bonuses of this music (which is only a part of a much longer piece) is the descending C major scale -- perhaps your student's first real piano piece in which to use the whole C scale! This version with whole-notes in the left hand is an easy way to approach it.