Children's abacus abacus kindergarten calculation frame first grade abacus mental arithmetic counter primary school second grade mathematics teaching aids
12 years old 4 years old 3 years old 6 years old 5 years old 8 years old 7 years old 11 years old 9 years old 10 years old
place of origin:
Chinese mainland
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Unisex
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Five-level calculation stand (send counting stick formula table) Ten-level calculation stand (send counting stick formula table) Five-level calculation stand (no gift) Ten-level calculation stand (no gift)
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