Magnetic Circular Fractional Problem Demonstrator EVA Fractional Pieces Sponge Disc 9 Pieces of Primary School Mathematics Third Grade Teaching Aware

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The understanding of the fourth-order decimal teaching aids within ten thousand numbers in the second grade of primary school mathematics has a large number carry model.

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The derivation of the formula for calculating the circumference of the circle area demonstrates the transformation of the model circle into a rectangle.

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