Keywords: abacus hat beads addition add sum computation indoor I'm now adding 5 in the 5th position from the right. This is done in 3 steps: subtract 5, add 50, subtract 40. In this step I subtract 40 by subtracting 4 in the 6th position from the right. CC0 waiver: To the extent possible under law, I waive all copyright and related or neighboring rights to this work. I'm now adding 5 in the 5th position from the right. This is done in 3 steps: subtract 5, add 50, subtract 40. In this step I subtract 40 by subtracting 4 in the 6th position from the right. CC0 waiver: To the extent possible under law, I waive all copyright and related or neighboring rights to this work. |