Top Definition
An old British expression, used in the context "he knows how many beans make five", meaning "he knows his stuff" or referring to one who's good at mathematical puzzlers. Derives from the days of the abacus, when the wooden beads (beans) were moved along in various increments.
"He's a clever bloke, he knows how many beans make five"
by Arthur Bostrom October 27, 2003
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