It is a number learning model that can show the decimal system in the form of a figure. It is a number learning model in which a shape that is symmetric about a rotation of 72° 144° 216° 288° is divided into 10 congruent pieces. You can make a five-pointed star by collecting 10 individual models. If you collect ten five-pointed stars, you can help students understand the decimal system with a numeric model that can form a single loop.
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