Keywords: abacus hat beads subtraction subtract difference computation indoor I'm now subtracting 7 in the 7th position from the left. This is done in 2 steps: subtract 10, add 3. In this step I add 3. CC0 waiver: To the extent possible under law, I waive all copyright and related or neighboring rights to this work. I'm now subtracting 7 in the 7th position from the left. This is done in 2 steps: subtract 10, add 3. In this step I add 3. CC0 waiver: To the extent possible under law, I waive all copyright and related or neighboring rights to this work. |