Rounding error

16.9 - 4.7 = 12.2

Sense rounds this off to 12.3
Not important, but I have a spreadsheet and now my values are different

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It is more likely that the individual values have been rounded (correctly) and that they summed up the raw values and rounded that separately. That is an incorrect practice. They should add up the rounded amounts.

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Iā€™m guessing the arithmetic was done with the full representation, but the displayed values are rounded:

16.94xxxx - 4.66xxxx = 12.29xxxx rounds individually to to 16.9 - 4.7 = 12.3

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