A language misunderstanding or a maths misunderstanding? You choose.
"These are all very much at the average end of the spectrum." (Seen on a fan site for some audio dramas.)
"No man but a blockhead ever wrote except for money." Samuel Johnson.
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That sounds like something Casey Stengel would have said.
I'd say both, Bob, though I probably would say "math misunderstanding."
I know we've talked about it here, but I just don't understand the use of "maths." I get "go to university" or "go to hospital" more.