| 摘要 |
PROBLEM TO BE SOLVED: To increase the visibility compared with a conventional expressing method by spots, and at the same time, enable large numbers to be expressed, and improve a mental arithmetic for an addition and a multiplication when a plurality of dices are used by expressing the spot numbers of a dice with Arabic numerals. SOLUTION: By expressing the spot numbers of a dice with Arabic numerals, and e.g. a dice with spot numbers of 1-6, and a dice with spot numbers of 5-10 are prepared, and these dices are freely paired and thrown. Then, when the dices are used for fundamental additions and multiplications for low graders of elementary school, the numerals of top faces are read, and a training for a mental arithmetic of additions and multiplications is performed. Also, in this case, respective dices may be color-sorted with two colors. In addition, by placing a property mark on the spot numbers of 6 and 9, 6 and 9 are prevented from being misread.
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