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If I am doing a problem and the answer needs to have 5 Sig Figs and the answer comes out to 0.001295 would you round and put a zero after the 9 (that becomes a 0 when you round up), leave it unrounded, or round without the zero?
The reason why the two 0's right after the decimal are not significant are because they serve as place holders. If you were to write this in scientific notation, those 0's would be gone. Therefore, you need to add 0 at the end to have 5 sig figs.
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