Calculate 29.308 + 2.34 + 50.99 and round to the correct number of significant digits.

All them all together that equal to 82.638 or 82.64

82.64

When you're rounding sig figs for adding or subtracting, just match the number of decimals in your answer to the number that you added/subtracted that had the least decimals

In the above problem, that number was 2.34, which went to the hundredth place. This means your answer also goes that far.

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