that only allows for 3 significant figures should be written.25. The result of an operation cannot have more significant figures that the value with the least number of significant figures. For example, when performing the operation.13.72.45, the value with the least number of sig figs (2).45. Hence, the result must have two significant figures as well:.18.104.22.168. This is a set of worked example problems illustrating how to determine significant figures. Multiple significant figure examples are provided. Even though both numbers involved in the subtraction have 5 significant figures, the answer only has 3 significant figures when rounded correctly. Significant Figures Example Chemistry Problem - ThoughtCo Math Skills - Scientific Notation Rounding Significant Figures Calculator Significant figures (practice) Khan Academy Significant Figures - Definition, Rules Examples Chemistry Remember, the answer must only have 1 doubtful digit. Multiplication: The answer must be rounded off to 2 significant figures, since.6 only has 2 significant figures. When rounding significant figures the standard rules of rounding numbers apply, except that non-significant digits to the left of the decimal are replaced with zeros. Example: 356 rounded to 2 significant digits is 3. This calculator rounds down if the next digit is less than 5 and rounds up when the next digit is greater than or equal.