I teach my pre-schoolers the days of the week by singing a song to the tune of "The Adams Family"
Days of the week
(snap, snap)
Days of the week
(snap, snap)
There's Sunday and there's Monday
There's Tuesday and there's Wednesday
There's Thursday and there's Friday
And then there's Saturday
Days of the week
(snap, snap)
Days of the week
(snap, snap)
Just keep repeating a couple of times