| 摘要 |
PROBLEM TO BE SOLVED: To provide a five colored regular icosahedron with figures up to 10 preferable for adding/reducing in learning, though a conventional hexahedron dice carries figures only from 1 to 6. SOLUTION: Though a conventional dice is a hexahedron, a five colored icosahedron with figures from 1 to 20 is devised. The icosahedron with figures from 1 to 20 facilitates arithmetical operation and increases interest of a game. Having five different colors further increases interest of a game. COPYRIGHT: (C)2009,JPO&INPIT
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