Significant figures or "sig figs" are
1) ALL non-zero numbers (1,2,3,4,5,6,7,8,9) are ALWAYS significant.
- 2) ALL zeroes between non-zero numbers are ALWAYS significant.
- 3) ALL zeroes which are SIMULTANEOUSLY to the right of the decimal point AND at the end of the number are ALWAYS significant.
- 4) ALL zeroes which are to the left of a written decimal point and are in a number >= 10 are ALWAYS significant.
- Further information on sig figs can be found at http://www.usca.edu/chemistry/genchem/sigfig.htm where i got the 4 rules listed above.
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