Keywords: abacus hat beads subtraction subtract difference computation indoor I'm now subtracting 9 in the 9th position from the left. This is done in 2 steps: subtract 10, add 1. In this step I subtract 10 by subtracting 1 in the 8th position from the left. CC0 waiver: To the extent possible under law, I waive all copyright and related or neighboring rights to this work. I'm now subtracting 9 in the 9th position from the left. This is done in 2 steps: subtract 10, add 1. In this step I subtract 10 by subtracting 1 in the 8th position from the left. CC0 waiver: To the extent possible under law, I waive all copyright and related or neighboring rights to this work. |