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How do I strip leading zeroes for math in a shell script?

I have a file containing lines of data that are amounts padded with leading zeros, similar to the snip below.   0000000004   0000000016   0000000012   0000000008 Using a shell script, how can I add up a column of numbers contained in lines when BASH interprets the numbers as octal when I do in-line math?...

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