Abacus pupils special abacus mental arithmetic wooden old-fashioned second grade second volume mathematical abacus solid wood seven beads 13 files wooden beads five beads 15 files small abacus teaching aids children's wooden Sujiao people's education version

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Color Classification:: ~~~The following is a 13-level 7-bead abacus~~~ (recommended by teachers) 13-level red abacus, teaching aid box, addition and subtraction cards, 13-level 7-beads (red) (gift abacus formula table for free

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