Keywords: abacus hat beads addition add sum computation I'm now adding 9 in the 9th position from the left (the rightmost position, the ones position). This is done in 2 steps: add 10, subtract 1. In this step I add 10 by adding 1 in the tens position. CC0 waiver: To the extent possible under law, I waive all copyright and related or neighboring rights to this work. I'm now adding 9 in the 9th position from the left (the rightmost position, the ones position). This is done in 2 steps: add 10, subtract 1. In this step I add 10 by adding 1 in the tens position. CC0 waiver: To the extent possible under law, I waive all copyright and related or neighboring rights to this work. |