Back to photostream

Adding 123456789 to itself on abacus in left-to-right order - Step 16

I'm now adding 8 in the 8th position from the left. This is done in 3 steps: add 50, subtract 40, subtract 2. In this step I add 50 by adding 5 in the 7th position from the left.

 

CC0 waiver: To the extent possible under law, I waive all copyright and related or neighboring rights to this work.

2,219 views
0 faves
0 comments
Uploaded on January 28, 2012
Taken on January 27, 2012