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Start adding at the left. The first on the right column is the units and the next one is the tens. So, add 3 to the tens column (3+2=5). We place 5 in the tens column. So the abacus represents now the number 54 (fig 2). Now, we add 6 to the units column (6+4=10). We place number 0 in the units column and we add the number 1 at the left |
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| fig 1 | fig 2 | fig 3 | column (fig 3). |
