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I have a Chemistry question which should be very simple but I do not know what significant figures are.

Assuming the following numbers are measurements and using the rules for significant figures, determine the answer for the following calculation.


1. 81.0059
2. 81.006
3. 81.01
4. 81.0
5. 81

The number obtained from the calculator is 81.00595238 should I just round or are significant figures something else entirely?

  • Chemistry -

    Here is a good site to read about s.f.

    15.5 has 3 s.f.
    42 has 2 s.f.
    219.5 has 4 s.f.
    This is a multiplication/division problem.
    So the answer may have no more than xxxx s.f.; therefore, the answer is xxxxx.

  • Chemistry -

    Thanks a lot!

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