FIELD: table games; development of mentality and skill in calculations. SUBSTANCE: mathematical game has game element which is, essentially, geometric body with trihedral tops whose polygonal faces bear mathematical symbols with addition and subtraction signs. All faces of game element are made in the form of regular pentagons; one of three faces converging on each top differs from remaining two by marking sign. EFFECT: improved amusing effect due to raising the role of random factor.
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