Question #204987

Solve with the correct number of sig figs...

620+32.22-16.5

Expert's answer

For **addition** and subtraction use the following **rules**: Count the number of **significant** figures in the decimal portion ONLY of each number in the problem. ... Your final answer may have no more **significant** figures to the right of the decimal than the LEAST number of **significant** figures in any number in the problem.

Here the least no of terms in right of the decimal is in 16.5 so the final answer should have only one significant value after decimal.

"620+32.22-16.5=635.72"

But we will only write one significant value after decimal so the final answer is"=635.7"

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