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A very ingenious calculating tool for working with numbers from 1 to 20 then 1 to 100, and performing calculations. Just by rotating them, the grey beads become visible and marked with a number corresponding to their position in the number sequence. Seeing the number sequence and counting 2 by 2, learning to build ten (5 + 5), adding or subtracting are just a few of the aims of this abacus.
