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My TA said that you can wait to round the sig figs until the end because if you round in the middle of a calculation, it could mess up your final answer (but if you do use the proper sig figs during the calculation and do everything right, even if your answer is off a little you still get the points). It's really up to you because you might also forget to round to the correct sigfig at the end.
It is better to round off at the end of the problem, instead of in the middle of a calculation, to ensure accuracy. Use as many digits as possible in the middle of a calculation and just carry those numbers over until you're at the end of the problem.
Although most of the time it doesn't have a drastic difference, it's better to apply significant figures for the final answer only. This way, your final answer can be more accurate, since no numbers were rounded in the process. Hope this helps!
By using significant figures only in your final answer, you reduce the chance of creating rounding errors. Be sure to use your scientific calculator for calculations and use the unrounded numbers until you get to your final answer, which you should use significant figures for.
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