Question

Add the following measurements and round the answer to the correct number of significant digits. Be...

Add the following measurements and round the answer to the correct number of significant digits. Be sure to include the unit of the final measurement with the numerical answer.      

             0.59 cm
            36.23 cm                               This seems so simple, but I keep getting it wrong : (
      +    17.3 cm     

Science   Chemistry   
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Answer #1

On addition of these three numbers

0.59+36.23+17.3 = 54.12

The uncertainty in the calculated values is indicated by mentioning the number of significant figures. Significant figures are digits which are known with certainty.

In the figure 17.3 has only one digit after the decimal point and thus result should be reported only upto one digit after the decimal pont.

Therefore we have round off the answer. If the rightmost digit to be removed is less than 5, the preceding number is not changed.

Here also in this 54.12 will be rounded off as 54.1

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