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It's always good to leave a couple of decimal points when computing your answer, as it will get as close to the real answer as possible, however, your final answer should include the correct amount of sig figs.
I asked one of the T.A.'s this question and he said that as long as in the steps of your calculation, you use more decimals than the required amount of sig figs, then you should be able to receive the correct answer when rounding at the end.
Use the "Ans" key on your calculator whenever possible. We're allowed to use scientific calculators but not graphing calculators, so you should be able to store values. Also, I generally leave at least 5 numbers after each decimal point (for each step) and apply sig figs at the very end.
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