You just did. Here's two more: The number 303 has three significant figures. George Washington and Thomas Jefferson were significant figures in the American Revolution.
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Use the rules of significant figures to answer the following : 22.674 * 15.05. Answer: 341.2
The least number of significant figures in any number of the problem determines the number of significant figures in the answer.
The number of significant figures after the decimal place matches the number of significant figures before the computation of the logarithm. Thus ln(3.02) would compute to 1.105. Three significant figures to four significant figures (3, after the decimal place).
The accuracy of the answer is limited to the LEAST significant figures of the input. So if two measured quantities are multiplied or divided, one of which is accurate to only two significant figures, and other to six significant figures, the answer is only accurate to two significant figures. HOWEVER: use all the figures you have for the calculation, and then round your answer to two significant figures. Also, however, remember that if you are multiplying by an actual exact number, as in doubling, the significant figures of that 2 is unlimited, so the answer is only limited by the significant figures of the number you are doubling.
The least number of significant figures in any number of the problem determines the number of significant figures in the answer which in this case is 270.9