@steve@pkhuong@zwarich Anyway, my point wasn't so much that people don't understand multiplication and especially long division, but that if we had applied the standard of wanting to deeply understand things before going through a learning process we would all still be stuck at long multiplication, probably. But I do have a personal anecdote about long division that shocked me, when I realized after already being in university for math that I hadn't understood the role of quotient estimation.