Great artwork, Steve!!
The labels would be Greek letters
Best. Comic. Ever!
Eggcorn is the more general term; mondegreen was originally for song lyrics.
Nit pick: a rhombus has equal sides.
Actually I use this rule and others of that ilk every day doing KENKEN puzzles. (Mathematician.) BTW, for very long numbers, just keep reducing module 3 as you go along; never have to add big numbers.
Always teach approximating the answer. Should be a bit more than 9.
I got these numbers from Wolfram Alpha, asking for square pyramidal numbers.
His pyramid wasn’t perfect; that’s not a pyramidal number: p(145)=1026745, p(146)=1048061.
No, it is indeterminate.