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