Keywords: abacus hat beads subtraction subtract difference computation indoor I'm now subtracting 6 in the 6th position from the left. This is done in 3 steps: subtract 10, add 5, subtract 1. In this step I add 5. CC0 waiver: To the extent possible under law, I waive all copyright and related or neighboring rights to this work. I'm now subtracting 6 in the 6th position from the left. This is done in 3 steps: subtract 10, add 5, subtract 1. In this step I add 5. CC0 waiver: To the extent possible under law, I waive all copyright and related or neighboring rights to this work. |