There’s a song on YouTube that my kid and a bunch of his classmates used to memorize the first 100 digits of pi. When they were 6 the entire class memorized the periodic table similarly using a YouTube song as well.
Funny thing is that another kid memorized pi to over 500 digits just from pure memorization.
I assume my daughter used that song as well. I remember us sitting at the dining room table and her peeling off 100 digits of pi. I explained to her that that would provide an accuracy such that a circle the size of the observable universe would be accurate to within a Planck length.
Fun memory from 16 years ago. Next month she'll be obtaining her PhD in physics.
Funny thing is that another kid memorized pi to over 500 digits just from pure memorization.