| 摘要 |
An educational device comprising a holder or axle (2) for a plurality of side by side revolvable arms (3) or counters whereby in use the arms revolve by twirling the holder or by manipulating arms so that when placed on a support surface some arms lie on the left hand side of the holder while the remaining arms lie on the right hand side of the holder. The device consists of arms which revolve on a handle (1). It can be manipulated in a number of ways and adapts both to play and to serious educational purpose. In broad educational mode the device is an exploration tool and toy where children can develop skills and play invented games or invent their own. In its main educational use, the device is a mathematics exploration tool and toy; is of a construction which makes it compatible with the decimal system of number among others; and in particular provides a visual-kinaesthetic method for the teaching/learning/understanding/exploration of mathematics.
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