Crossword Genius

Addition column (4)

Ross

I think it could be either:

ones

tens

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">addition column</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(Other definitions for ones that I've seen before include "Singletons" , "(Of ship) returning to port of origin" , "Units" , "Individuals" , "1 & 1 & 1" .)

I've seen this clue in The Wall Street Journal, the King Feature Syndicate and the LA Times.
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