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Whenever doing calculations you want to make sure that your final answer is no more precise than the least precise answer. For example, when doing 6.23 + 4.5613, the answer won't be 10.7913, but rather 10.79. 6.23 is the least precise number within the calculations, so your final answer needs to reflect that.
You're supposed to go based off the value with lowest significant figures given in the problem. For example, if you were given the values 6.38 and 43.58 in a homework problem, your final answer should include 3 significant figures.
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