Geometrical Shapes

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A magnetic fraction disc set with a magnetic board is a visual aid used to teach fractions. The set typically includes a magnetic board and color-coded, foam fraction discs that represent different fractions (halves, thirds, fourths, etc.). The discs are designed to be easily grasped and manipulated, allowing children to physically explore and understand equivalent fractions, common denominators, and other fraction concepts. 

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A hollow transparent sphere is a three-dimensional object characterized by its spherical shape, transparent or clear material, and an interior cavity or hollow space. It's essentially a sphere with a void inside, unlike a solid sphere which is filled with material throughout.