Subtracting 123456789 from 246913578 in left-to-right order - Step 1

In this exercise I'm showing how to compute 246913578 minus 123456789 = 123456789 on the giant Soda Hall abacus. I subtract in left-to-right order, first subtracting 1 in the leftmost column, then 2 in the next column to the right, etc.

 

In this series, I am not present - this makes it less obvious what was changed, but does not occlude the abacus.

 

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Done