There are three attributes of every measured quantity - the amount, the unit of measurement, and the degree of precision to which the measurement was made. The latter, often ignored attribute, expresses itself by the number of significant figures in the numerical value. For instance 65000 has two significant digits and shows a lower degree of precision than 64982 with its five significant digits.
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Determining the number of significant digits in a reported value does not have to be difficult. The two graphics below explain what significant digits are and elaborates on how to count the number of significant digits. Eight examples are provided. Read the rules, study the three types of zeroes, inspect the eight examples and their answers, and then nail this question with confidence.