The numbers 23.982 and 3.4687 are both approximate and correct only to their last digits. Find their difference and state how many figures in the result are trustworthy.

## Find their difference?

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# 2 Answers

23.982-3.4687 = 20.513, which contains 5 significant figures.

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Attn: Since the result of addition or subtraction should be no more accurate than the least accurate one.

Sun, what does your teacher expect? I would assume your teacher would have covered the definition of "trustworthy figures" to you at some point. Without knowing if this is a specific math problem (and no more), or if there's another part to this question
(as with a statistical analysis or interpreting the results of a scientific study), it's difficult to answer your question.

## Comments

Because both numbers are with 5 significant figures, then result should be with 5 significant and trustworthy figures too. Only my question is, do we have to accompany the result with the relative error of the round-off?

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