Keywords: abacus hat beads addition add sum computation I'm now adding 6 in the 4th position from the right. This is done in 3 steps: add 1, subtract 5, add 10. I begin in this step by adding 1. CC0 waiver: To the extent possible under law, I waive all copyright and related or neighboring rights to this work. I'm now adding 6 in the 4th position from the right. This is done in 3 steps: add 1, subtract 5, add 10. I begin in this step by adding 1. CC0 waiver: To the extent possible under law, I waive all copyright and related or neighboring rights to this work. |