Ha! I was taught Chisanbop but never knew the name for it. My kids picked it up from me, because counting to 99 on the fingers is a kind of superpower.
ETA: Oddly, I did not go to a progressive elementary school in Santa Monica. I went to a redneck school in northern Canada in the 70s. I’m flabbergasted that the idea spread that far in a pre-internet world.
