Adding and subtracting is much easier with these beadstrings! Each string has 20 beads, in groups of 5 red beads and 5 white beads. 10 strings in the set.
EFMT14083 - 20 Bead Strings - Teacher
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EDX Education string, 20 Bead, 10 mm Diameter Set of 10, 53969 & Wissner 80200.2 active learning Active Learning 20 Student´S Abacus, Re-Wood Red/White, Sloped Version : : Toys & Games
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EFMT14083 - 20 Bead Strings - Teacher