Keywords: abacus hat beads addition add sum computation indoor I'm now adding 3 in the 3rd position from the left. This is done in 2 steps: add 5, subtract 2. In this step I subtract 2. CC0 waiver: To the extent possible under law, I waive all copyright and related or neighboring rights to this work. I'm now adding 3 in the 3rd position from the left. This is done in 2 steps: add 5, subtract 2. In this step I subtract 2. CC0 waiver: To the extent possible under law, I waive all copyright and related or neighboring rights to this work. |