Keywords: abacus beads addition add sum computation indoor photo border In this exercise I'm showing how to add the number 123456789 to itself on the giant Soda Hall abacus. I add in right-to-left order, first adding 9 in the ones column, then 8 in the tens column, etc. This first step shows 123456789 entered on the abacus. CC0 waiver: To the extent possible under law, I waive all copyright and related or neighboring rights to this work. In this exercise I'm showing how to add the number 123456789 to itself on the giant Soda Hall abacus. I add in right-to-left order, first adding 9 in the ones column, then 8 in the tens column, etc. This first step shows 123456789 entered on the abacus. CC0 waiver: To the extent possible under law, I waive all copyright and related or neighboring rights to this work. |