significant figures are simple once you get the few rules down!
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When you add and subtract you must...Count the number of significant figures in the decimal portion ONLY of each number in the problemAdd or subtract in the normal fashion 3. 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.
To find out the # of significant numbers Non-zero digits are always significantAny zeros between two significant digits are significantA final zero or trailing zeros in the decimal portion ONLY are significant
*This means you have to be able to recognize significant figures in order to use this rule* Example: 5.26 has 3 significant figures 6.1 has 2 significant figures
The LEAST number of significant figures in any number of the problem determines the number of significant figures in the answer. (You are now looking at the entire number, not just the decimal portion