Keywords: abacus hat beads addition add sum computation I'm now adding 8 in the tens position. This is done in 2 steps: add 10, subtract 2. In this step I add 10 (by adding 1 in the hundreds position). CC0 waiver: To the extent possible under law, I waive all copyright and related or neighboring rights to this work. I'm now adding 8 in the tens position. This is done in 2 steps: add 10, subtract 2. In this step I add 10 (by adding 1 in the hundreds position). CC0 waiver: To the extent possible under law, I waive all copyright and related or neighboring rights to this work. |